Revert "Fix the clang build: this compiler doesn't support the gnu_inline function attribute"

This reverts commit 4f1f149c3757c594f9ff987e5ddd919c3e7dba10.
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index f088e33..987a5e3 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -502,18 +502,11 @@
 #include <android/api-level.h>
 
 #if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 0 && defined(__OPTIMIZE__) && __OPTIMIZE__ > 0
-#if defined(__clang__)
-#define __BIONIC_FORTIFY_INLINE \
-    extern inline \
-    __attribute__ ((always_inline)) \
-    __attribute__ ((artificial))
-#else
 #define __BIONIC_FORTIFY_INLINE \
     extern inline \
     __attribute__ ((always_inline)) \
     __attribute__ ((gnu_inline)) \
     __attribute__ ((artificial))
-#endif
 #define __BIONIC_FORTIFY_UNKNOWN_SIZE ((size_t) -1)
 #endif