Fix deplibs check fallback for 64-bit Windows and Windows CE.

Fix deplibs check fallback for 64-bit Windows and Windows CE.

* libltdl/m4/libtool.m4 (_LT_CHECK_MAGIC_METHOD): Accept file formats
'pe-arm-wince' and 'pe-x86-64'.  Add note about consistency with ...
* libltdl/config/ltmain.m4sh (func_win32_libid): ... the respective
pattern here; sync pattern from the former.
* tests/deplibs-mingw.at (deplibs without file command): New
file, new test.
* Makefile.am (TESTSUITE_AT): Update.
* NEWS: Update.

Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>