mmap15: Enable in compat mode

Test actually runs well in compat mode. Skipping in 32 bit was
originally added bc8d45a (in 2004, in hugemmap03.c), likely kernel or
libc functionality changed.

Tested on recent 6.7 kernel and 8 years old 4.4 kernel.

Link: https://lore.kernel.org/ltp/[email protected]/
Reviewed-by: Li Wang <[email protected]>
Signed-off-by: Petr Vorel <[email protected]>

Author: pevik

testcases/kernel/syscalls/mmap/mmap15.c

@@ -61,6 +61,5 @@ static struct tst_test test = {
 	.setup = setup,
 	.cleanup = cleanup,
 	.test_all = run,
-	.skip_in_compat = 1,
 	.needs_tmpdir = 1
 };