arch/alpha: disable stack protector

Hard coded into GCC.

Author: Cyanoxygen

arch/alpha.sh

@@ -4,3 +4,6 @@
 CFLAGS_COMMON_ARCH=('-mieee' '-mcpu=ev4')
 # Retro: Overriding mainline definitions, and take more interest in reducing code size.
 CFLAGS_COMMON_ARCH+=('-O2' '-fno-tree-ch')
+# NOTE: Despite the stack growing downwards, they hardcoded
+# FRAME_GROWS_DOWNWARD to 0, so no stack protector support.
+AB_FLAGS_SSP=0