Cygwin bugs for which Gnulib adds workarounds

[Bruno Haible]

Hi Ken,

Thank you for having a look at the canonicalize problem (on which I'm
not yet convinced that it's a bug in Cygwin - it could also be a problem
on Gnulib's side).

When I look at the config.cache file on Cygwin 2.9, and in particular the
*_works variable whose value is 'no', I see a number of issues that could
be worth fixing in Cygwin. You find the test case in the corresponding *.m4
file.

* chown.m4
  gl_cv_func_chown_ctime_works=no

* fchmodat.m4
  gl_cv_func_fchmodat_works=no

* fcntl.m4
  gl_cv_func_fcntl_f_dupfd_works=no

* fma.m4
  gl_cv_func_fma_works=no

* fmaf.m4
  gl_cv_func_fmaf_works=no

* fmal.m4
  gl_cv_func_fmal_works=no

* frexpl.m4
  gl_cv_func_frexpl_works=no

* getdtablesize.m4
  gl_cv_func_getdtablesize_works=no

* ilogbl.m4
  gl_cv_func_ilogbl_works=no

* log2.m4
  gl_cv_func_log2_works=no

* log2f.m4
  gl_cv_func_log2f_works=no

* pwrite.m4
  gl_cv_func_pwrite_works=no

* strtod.m4
  gl_cv_func_strtod_works=no

* strfmon_l.m4
  gl_cv_strfmon_l_works=no

* uchar.m4
  gl_cv_type_char16_t_works=no
  gl_cv_type_char32_t_works=no

There are surely more issues, listed in *.m4 files or in the documentation,
but it's harder to get a list of.

Bruno