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>