ucl: Use -std=iso9899:1990 instead of -std=c90

The shorter alias, -std=c90, is not known by older versions of GCC.
See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=20631.

Signed-off-by: Alexey Neyman <stilor@att.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
1 file changed