security/lua-bcrypt: fix build

Add USES=compiler:c11 to fix build:
compat/safebfuns.c:25:4: error: #error "require gcc >= 4.4"
compat/safebfuns.c:32: error: expected '=', ',', ';', 'asm' or 'attribute' before 'NOINLINE'
compat/safebfuns.c:41: error: expected '=', ',', ';', 'asm' or 'attribute' before 'NOINLINE'

Approved by: mentors (implicit approval)