fix AVX,AVX2,FMA,F16C detection on Linux and add flags for OpenBLAS

Makefile

@@ -50,8 +50,8 @@ endif
 # TODO: probably these flags need to be tweaked on some architectures
 #       feel free to update the Makefile for your architecture and send a pull request or issue
 ifeq ($(UNAME_M),x86_64)
-	CFLAGS += -mfma -mf16c
 	ifeq ($(UNAME_S),Darwin)
+		CFLAGS += -mfma -mf16c
 		AVX1_M := $(shell sysctl machdep.cpu.features)
 		ifneq (,$(findstring AVX1.0,$(AVX1_M)))
 			CFLAGS += -mavx
@@ -60,8 +60,26 @@ ifeq ($(UNAME_M),x86_64)
 		ifneq (,$(findstring AVX2,$(AVX2_M)))
 			CFLAGS += -mavx2
 		endif
+	endif
+	ifeq ($(UNAME_S),Linux)
+		AVX1_M := $(shell grep "avx " /proc/cpuinfo)
+		ifneq (,$(findstring avx,$(AVX1_M)))
+			CFLAGS += -mavx
+		endif
+		AVX2_M := $(shell grep "avx2 " /proc/cpuinfo)
+		ifneq (,$(findstring avx2,$(AVX2_M)))
+			CFLAGS += -mavx2
+		endif
+		FMA_M := $(shell grep "fma " /proc/cpuinfo)
+		ifneq (,$(findstring fma,$(FMA_M)))
+			CFLAGS += -mfma
+		endif
+		F16C_M := $(shell grep "f16c " /proc/cpuinfo)
+		ifneq (,$(findstring f16c,$(F16C_M)))
+			CFLAGS += -mf16c
+		endif
 	else
-		CFLAGS += -mavx -mavx2
+		CFLAGS += -mfma -mf16c -mavx -mavx2
 	endif
 endif
 ifeq ($(UNAME_M),amd64)
@@ -74,6 +92,10 @@ ifndef WHISPER_NO_ACCELERATE
 		LDFLAGS += -framework Accelerate
 	endif
 endif
+ifdef WHISPER_OPENBLAS
+	CFLAGS  += -DGGML_USE_OPENBLAS -I/usr/local/include/openblas
+	LDFLAGS += -lopenblas
+endif
 ifneq ($(filter aarch64%,$(UNAME_M)),)
 endif
 ifneq ($(filter armv6%,$(UNAME_M)),)