Fix calling convention tests

Seems like recent compiler changes no longer allow invalid calling conventions

Author: nyurik

bindgen-tests/tests/expectations/tests/abi-override.rs

@@ -1,4 +1,4 @@
-// bindgen-flags: --override-abi=foo=fastcall --override-abi=bar=stdcall --override-abi=boo=efiapi --override-abi=foobar=efiapi --override-abi qux=system
+// bindgen-flags: --override-abi=foo=fastcall --override-abi=bar=stdcall --override-abi=boo=efiapi --override-abi=foobar=efiapi --override-abi qux=system --raw-line '#![cfg(target = "i686-pc-windows-msvc")]'
 
 void foo();
 void bar();

bindgen-tests/tests/expectations/tests/mangling-win32.rs

@@ -1,4 +1,4 @@
-// bindgen-flags: -- --target=i686-pc-win32
+// bindgen-flags: --raw-line '#![cfg(target = "i686-pc-windows-msvc")]' -- --target=i686-pc-win32
 
 extern "C" void foo();