luajit: fix compilation with host clang

It errors out with this section.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

lang/luajit/patches/020-clang.patch

+--- a/src/lj_arch.h
++++ b/src/lj_arch.h
+@@ -391,9 +391,6 @@
+ #endif
+ #endif
+ #elif !LJ_TARGET_PS3
+-#if (__GNUC__ < 4) || ((__GNUC__ == 4) && __GNUC_MINOR__ < 3)
+-#error "Need at least GCC 4.3 or newer"
+-#endif
+ #endif
+ #endif
+