amd/common: Add extern "C" to some headers that were missing it.

We'd like to include some of these in C++ code later.
Specifically, ACO is written in C++ and we would like to use
some of this code in ACO in order to avoid code duplication.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>

src/amd/common/ac_shader_util.h

@@ -31,6 +31,10 @@
 #include "ac_binary.h"
 #include "compiler/nir/nir.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 enum ac_image_dim {
 	ac_image_1d,
 	ac_image_2d,
@@ -69,4 +73,8 @@ ac_get_fs_input_vgpr_cnt(const struct ac_shader_config *config,
 			 signed char *face_vgpr_index,
 			 signed char *ancillary_vgpr_index);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif