Try to fix arm bots by removing a superfluous __cdecl

llvm-svn: 204872
diff --git a/clang/test/Sema/MicrosoftExtensions.c b/clang/test/Sema/MicrosoftExtensions.c
index a4afcb1..b199644 100644
--- a/clang/test/Sema/MicrosoftExtensions.c
+++ b/clang/test/Sema/MicrosoftExtensions.c
@@ -133,7 +133,7 @@
 T __ptr32 wrong10; // expected-error {{'__ptr32' attribute only applies to pointer arguments}}
 
 typedef char *my_va_list;
-void __cdecl __va_start(my_va_list *ap, ...); // expected-note {{passing argument to parameter 'ap' here}}
+void __va_start(my_va_list *ap, ...); // expected-note {{passing argument to parameter 'ap' here}}
 void vmyprintf(const char *f, my_va_list ap);
 void myprintf(const char *f, ...) {
   my_va_list ap;