configure: Skip check for inline assembly capabilities when explicitly disabled

Otherwise inline assembly may get enabled when disabled on the command line.

configure

@@ -4251,7 +4251,7 @@ EOF
 sym=$($nm $TMPO | awk '/ff_extern/{ print substr($0, match($0, /[^ \t]*ff_extern/)) }')
 extern_prefix=${sym%%ff_extern*}
 
-check_inline_asm inline_asm '"" ::'
+! disabled inline_asm && check_inline_asm inline_asm '"" ::'
 
 _restrict=
 for restrict_keyword in restrict __restrict__ __restrict; do