ignore -Wpragmas as well

Change-Id: I10ce7aed306150dac08563782bccd2b8f5dd01d9

Author: mauri870

src/runtime/cgo/gcc_libinit.c

@@ -7,9 +7,8 @@
 // When cross-compiling with clang to linux/armv5, atomics are emulated
 // and cause a compiler warning. This results in a build failure since
 // cgo uses -Werror. See #65290.
-#if defined(__clang__)
+#pragma GCC diagnostic ignored "-Wpragmas"
 #pragma GCC diagnostic ignored "-Watomic-alignment"
-#endif
 
 #include <pthread.h>
 #include <errno.h>