binconfig.bbclass: fix get_binconfig_mangle()

binconfig.bbclass: fix get_binconfig_mangle()

The command was:
s += " -e 's:-L${libdir}:-LOELIBDIR:;'"
s += " -e 's:-I${includedir}:-IOEINCDIR:;'"
s += " -e 's:OELIBDIR:${STAGING_LIBDIR}:;'"
s += " -e 's:OEINCDIR:${STAGING_INCDIR}:;'"
s += " -e 's:-I${WORKDIR}:-I${STAGING_INCDIR}:'"
s += " -e 's:-L${WORKDIR}:-L${STAGING_LIBDIR}:'"

The STAGING_LIBDIR and STAGING_INCDIR now contains WORKDIR, so the
result would be incorrect like:
TCL_INCLUDE_SPEC='-IFIXMESTAGINGDIRTARGET/usr/include/recipe-sysroot/usr/include/tcl8.6'

Note, the "/usr/include/recipe-sysroot" is not needed. Move the last two
sed commands ahead will fix the problem.

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>