check-kernel-headers: mktemp --tmpdir not available on RedHat RHEL5

mktemp --tmpdir is not available on older Redhat RHEL5 machines. The
alternative that has the same behavior is 'mktemp -t'.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/scripts/check-kernel-headers.sh

@@ -8,7 +8,7 @@ HDR_M="${HDR_VER%%.*}"
 HDR_V="${HDR_VER#*.}"
 HDR_m="${HDR_V%%.*}"
 
-EXEC="$(mktemp --tmpdir check-headers.XXXXXX)"
+EXEC="$(mktemp -t check-headers.XXXXXX)"
 
 # We do not want to account for the patch-level, since headers are
 # not supposed to change for different patchlevels, so we mask it out.