[cmake] fixes for XCode when having languages other than C/C++

Signed-off-by: lizzie <lizzie@eden-emu.dev>

src/input_common/CMakeLists.txt

@@ -44,9 +44,7 @@ if (MSVC)
         /we4800 # Implicit conversion from 'type' to bool. Possible information loss
     )
 else()
-    target_compile_options(input_common PRIVATE
-        -Werror=conversion
-    )
+    target_compile_options(input_common PRIVATE $<$<COMPILE_LANGUAGE:C,CXX>:-Werror=conversion>)
 endif()
 
 if (ANDROID)