build: use -fstack-check=no when available

build: use -fstack-check=no when available

Some compilers (such as the one in hardened/Gentoo) default this
option to on which leads to build failures:
src/stacks.c: In function 'call16_back':
src/stacks.c:139:5: error: 'asm' operand has impossible constraints
     asm volatile(
     ^

URL: https://bugs.gentoo.org/559980
Reported-by: Alon Bar-Lev <alonbl@gentoo.org>
Signed-off-by: Magnus Granberg <zorry@gentoo.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>