docs: update cygwin progress

docs: update cygwin progress

* doc/glibc-functions/mkostemp.texi (mkostemp): Added in cygwin
1.7.6.
* doc/glibc-functions/mkostemps.texi (mkostemps): Likewise.
* doc/posix-headers/fenv.texi (fenv.h): Added after cygwin 1.7.7.
* doc/posix-functions/feclearexcept.texi (feclearexcept): Likewise.
* doc/posix-functions/fegetenv.texi (fegetenv): Likewise.
* doc/posix-functions/fegetexceptflag.texi (fegetexceptflag):
Likewise.
* doc/posix-functions/fegetround.texi (fegetround): Likewise.
* doc/posix-functions/feholdexcept.texi (feholdexcept): Likewise.
* doc/posix-functions/feraiseexcept.texi (feraiseexcept):
Likewise.
* doc/posix-functions/fesetenv.texi (fesetenv): Likewise.
* doc/posix-functions/fesetexceptflag.texi (fesetexceptflag):
Likewise.
* doc/posix-functions/fesetround.texi (fesetround): Likewise.
* doc/posix-functions/fetestexcept.texi (fetestexcept): Likewise.
* doc/posix-functions/feupdateenv.texi (feupdateenv): Likewise.
* doc/glibc-functions/feenableexcept.texi (feenableexcept):
Likewise.
* doc/glibc-functions/fedisableexcept.texi (fedisableexcept):
Likewise.
* doc/glibc-functions/fegetexcept.texi (fegetexcept): Likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>