fixed gemma4v image crashing on encode, however images are not yet working correctly

tools/mtmd/clip.cpp

@@ -4041,6 +4041,10 @@ bool clip_is_llava(const struct clip_ctx * ctx) {
     return ctx->model.hparams.has_llava_projector;
 }
 
+bool clip_is_gemma4(const struct clip_ctx * ctx) { //for kcpp use
+    return ctx->proj_type() == PROJECTOR_TYPE_GEMMA4V;
+}
+
 bool clip_has_vision_encoder(const struct clip_ctx * ctx) {
     return ctx->model.modality == CLIP_MODALITY_VISION;
 }