m4: fdopen() with a text mode explicitly on OS/2.

On OS/2 kLIBC, fdopen() creates a stream in a mode of a file
descriptor. So specify "t" to open a stream in a text mode explicitly
on OS/2.
* modules/gnu.c (m4_esyscmd): fdopen() in a text mode on OS/2.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>
1 file changed