update to 1.5.1, reenable METAL GPU support

Author: wuxxin

Makefile

@@ -22,7 +22,7 @@ RWKV_REPO?=https://github.com/donomii/go-rwkv.cpp
 RWKV_VERSION?=c898cd0f62df8f2a7830e53d1d513bef4f6f792b
 
 # whisper.cpp version
-WHISPER_CPP_VERSION?=d38af151a1ed5378c5a9ae368e767ed22c8ab141
+WHISPER_CPP_VERSION?=9d6ebd877ce7d99053423d186e6f5387a4a4753c
 
 # bert.cpp version
 BERT_VERSION?=6abe312cded14042f6b7c3cd8edf082713334a4d
@@ -103,7 +103,7 @@ endif
 ifeq ($(BUILD_TYPE),metal)
 	CGO_LDFLAGS+=-framework Foundation -framework Metal -framework MetalKit -framework MetalPerformanceShaders
 	export LLAMA_METAL=1
-	# export WHISPER_METAL=1
+	export WHISPER_METAL=1
 endif
 
 ifeq ($(BUILD_TYPE),clblas)