Revert "Fix clang build."

Bug: http://b/20065774
This reverts commit 0975a5d9d2.

(cherry picked from commit 6f0d7005f9)

libc/arch-arm64/bionic/libgcc_compat.c

@@ -1,7 +1,5 @@
 /* STOPSHIP: remove this once the flounder blobs have been rebuilt (http://b/20065774). */
 
-#if defined(__clang__)
-
 extern void __clear_cache(char*, char*);
 extern char _Unwind_Backtrace;
 extern char _Unwind_GetIP;
@@ -11,5 +9,3 @@ void* __bionic_libgcc_compat_symbols[] = {
     &_Unwind_Backtrace,
     &_Unwind_GetIP,
 };
-
-#endif