math: xfail some sinpi tests for ibm128-libgcc

math: xfail some sinpi tests for ibm128-libgcc

On powerpc math/test-ibm128-sinpi shows:

testing long double (without inline functions)
Failure: sinpi_downward (-0xf.ffffffffffffbffffffffffffcp+1020): Exception "Invalid operation" set
Failure: sinpi_downward (-0xf.ffffffffffffbffffffffffffcp+1020): Exception "Overflow" set
Failure: sinpi_downward (-0xf.ffffffffffffbffffffffffffcp+1020): errno set to 33, expected 0 (unchanged)
Failure: Test: sinpi_downward (-0xf.ffffffffffffbffffffffffffcp+1020)
Result:
 is:         qNaN
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
Failure: Test: sinpi_downward (0x3.fffffffffffffffcp+108)
Result:
 is:          2.97479253223185882765417834495004e-15   0x1.acb679186c7b49a36c9ec63e110p-49
 should be:   0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 difference:  2.97479253223185882765417834495004e-15   0x1.acb679186c7b49a36c9ec63e110p-49
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  4.0000
Failure: Test: sinpi_downward (0x3.ffffffffffffffffffffffffffp+108)
Result:
 is:          2.63250110604328276654475674742669e-15   0x1.7b6225fa8503a5a8c514f5c0208p-49
 should be:   0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 difference:  2.63250110604328276654475674742669e-15   0x1.7b6225fa8503a5a8c514f5c0208p-49
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  4.0000
Failure: Test: sinpi_towardzero (-0x3.fffffffffffffffcp+108)
Result:
 is:         -1.71856472474338625450766636956702e-14  -0x1.3596cf230d8f69346d93d8c3100p-46
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  1.71856472474338625450766636956702e-14   0x1.3596cf230d8f69346d93d8c3100p-46
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  3.0000
Failure: Test: sinpi_towardzero (-0x3.ffffffffffffffffffffffffffp+108)
Result:
 is:         -9.73792846364428462525599942305655e-15  -0x1.5ed8897ea140e96a31453d6e580p-47
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  9.73792846364428462525599942305655e-15   0x1.5ed8897ea140e96a31453d6e580p-47
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  3.0000
Failure: Test: sinpi_towardzero (0x3.fffffffffffffffcp+108)
Result:
 is:          1.71856472474338625450766636956702e-14   0x1.3596cf230d8f69346d93d8c3100p-46
 should be:   0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 difference:  1.71856472474338625450766636956702e-14   0x1.3596cf230d8f69346d93d8c3100p-46
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  3.0000
Failure: Test: sinpi_towardzero (0x3.ffffffffffffffffffffffffffp+108)
Result:
 is:          9.73792846364428462525599942305655e-15   0x1.5ed8897ea140e96a31453d6e580p-47
 should be:   0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0
 difference:  9.73792846364428462525599942305655e-15   0x1.5ed8897ea140e96a31453d6e580p-47
 ulp       :  179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321
 max.ulp   :  3.0000
Failure: Test: sinpi_upward (-0x3.fffffffffffffffcp+108)
Result:
 is:         -1.71856472474338625450766636956709e-14  -0x1.3596cf230d8f69346d93d8c3110p-46
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  1.71856472474338625450766636956710e-14   0x1.3596cf230d8f69346d93d8c3110p-46
 ulp       :  inf
 max.ulp   :  4.0000
Failure: Test: sinpi_upward (-0x3.ffffffffffffffffffffffffffp+108)
Result:
 is:         -9.73792846364428462525599942305708e-15  -0x1.5ed8897ea140e96a31453d6e598p-47
 should be:  -0.00000000000000000000000000000000e+00  -0x0.000000000000000000000000000p+0
 difference:  9.73792846364428462525599942305709e-15   0x1.5ed8897ea140e96a31453d6e598p-47
 ulp       :  inf
 max.ulp   :  4.0000
Failure: sinpi_upward (0xf.ffffffffffffbffffffffffffcp+1020): Exception "Invalid operation" set
Failure: sinpi_upward (0xf.ffffffffffffbffffffffffffcp+1020): Exception "Overflow" set
Failure: sinpi_upward (0xf.ffffffffffffbffffffffffffcp+1020): errno set to 33, expected 0 (unchanged)
Failure: Test: sinpi_upward (0xf.ffffffffffffbffffffffffffcp+1020)
Result:
 is:         qNaN
 should be:   0.00000000000000000000000000000000e+00   0x0.000000000000000000000000000p+0