make : improve cpuinfo handling on x86 hosts (ggerganov#1238)

* make : simplify and correct x86 ISA extensions detection on the host

It got broken in commit c5f9acf for Haiku and Mac OS (Intel),
which report CPU features in upper case.

Now we're finding the names in case-insensitive manner and as words.
SSE3 detection has been corrected for Linux, which uses PNI for that
(Prescott New Instructions).

* make : use dmesg.boot in FreeBSD/DragonFlyBSD to detect x86 ISA extensions on the host

* make : enable x86 ISA extensions on the host both in CFLAGS and CXXFLAGS

* make : correct AVX x86 ISA extension detection on macOS (Intel) host

It got broken in commit c5f9acf.  macOS calls it AVX1.0.

Makefile

@@ -65,57 +65,57 @@ endif
 # Architecture specific
 # 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 ($(UNAME_M),$(filter $(UNAME_M),x86_64 i686))
+ifeq ($(UNAME_M),$(filter $(UNAME_M),x86_64 i686 amd64))
  ifeq ($(UNAME_S),Darwin)
  CPUINFO_CMD := sysctl machdep.cpu.features
  else ifeq ($(UNAME_S),Linux)
  CPUINFO_CMD := cat /proc/cpuinfo
  else ifneq (,$(filter MINGW32_NT% MINGW64_NT%,$(UNAME_S)))
  CPUINFO_CMD := cat /proc/cpuinfo
+ else ifneq (,$(filter DragonFly FreeBSD,$(UNAME_S)))
+ CPUINFO_CMD := grep Features /var/run/dmesg.boot
  else ifeq ($(UNAME_S),Haiku)
  CPUINFO_CMD := sysinfo -cpu
  endif
 
- ifdef CPUINFO_CMD 
- AVX_M := $(shell $(CPUINFO_CMD) | grep -m 1 "avx ")
- ifneq (,$(findstring avx,$(AVX_M)))
- CFLAGS += -mavx
- endif
-
- AVX2_M := $(shell $(CPUINFO_CMD) | grep -m 1 "avx2 ")
- ifneq (,$(findstring avx2,$(AVX2_M)))
- CFLAGS += -mavx2
+ ifdef CPUINFO_CMD
+ AVX_M := $(shell $(CPUINFO_CMD) | grep -iwE 'AVX|AVX1.0')
+ ifneq (,$(AVX_M))
+ CFLAGS += -mavx
+ CXXFLAGS += -mavx
  endif
 
- FMA_M := $(shell $(CPUINFO_CMD) | grep -m 1 "fma ")
- ifneq (,$(findstring fma,$(FMA_M)))
- CFLAGS += -mfma
+ AVX2_M := $(shell $(CPUINFO_CMD) | grep -iw 'AVX2')
+ ifneq (,$(AVX2_M))
+ CFLAGS += -mavx2
+ CXXFLAGS += -mavx2
  endif
 
- F16C_M := $(shell $(CPUINFO_CMD) | grep -m 1 "f16c ")
- ifneq (,$(findstring f16c,$(F16C_M)))
- CFLAGS += -mf16c
+ FMA_M := $(shell $(CPUINFO_CMD) | grep -iw 'FMA')
+ ifneq (,$(FMA_M))
+ CFLAGS += -mfma
+ CXXFLAGS += -mfma
+ endif
 
-  AVX1_M := $(shell $(CPUINFO_CMD) | grep -m 1 "avx ")
-  ifneq (,$(findstring avx,$(AVX1_M)))
-  CFLAGS += -mavx
- endif
+ F16C_M := $(shell $(CPUINFO_CMD) | grep -iw 'F16C')
+ ifneq (,$(F16C_M))
+ CFLAGS  += -mf16c
+ CXXFLAGS += -mf16c
  endif
 
- SSE3_M := $(shell $(CPUINFO_CMD) | grep -m 1 "sse3 ")
- ifneq (,$(findstring sse3,$(SSE3_M)))
- CFLAGS += -msse3
+ SSE3_M := $(shell $(CPUINFO_CMD) | grep -iwE 'PNI|SSE3')
+ ifneq (,$(SSE3_M))
+ CFLAGS += -msse3
+ CXXFLAGS += -msse3
  endif
 
- SSSE3_M := $(shell $(CPUINFO_CMD) | grep -m 1 "ssse3 ")
- ifneq (,$(findstring ssse3,$(SSSE3_M)))
- CFLAGS += -mssse3
+ SSSE3_M := $(shell $(CPUINFO_CMD) | grep -iw 'SSSE3')
+ ifneq (,$(SSSE3_M))
+ CFLAGS += -mssse3
+ CXXFLAGS += -mssse3
  endif
  endif
 endif
-ifeq ($(UNAME_M),amd64)
- CFLAGS += -mavx -mavx2 -mfma -mf16c
-endif
 
 ifneq ($(filter ppc64%,$(UNAME_M)),)
  POWER9_M := $(shell grep "POWER9" /proc/cpuinfo)