cmake: just don't bother with intel flags on OSX

CMakeLists.txt

@@ -12,7 +12,9 @@ set(HOG_INCLUDES
 set(CMAKE_CXX_STANDARD 17)
 
 file(GLOB HOG_SOURCES "src/hog.cpp")
-if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86)|(X86)|(amd64)|(AMD64)")
+if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
+  add_library(fasthog SHARED ${HOG_SOURCES})
+else()
   add_library(hog_sse4 OBJECT src/magnitude_orientation.cpp)
   set_property(TARGET hog_sse4 PROPERTY POSITION_INDEPENDENT_CODE ON)
   target_compile_options(hog_sse4 PRIVATE -msse4 -DVEC_T=Vec2d)
@@ -29,8 +31,6 @@ if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86)|(X86)|(amd64)|(AMD64)")
   target_include_directories(hog_avx512 PRIVATE ${HOG_INCLUDES})
 
   add_library(fasthog SHARED ${HOG_SOURCES} $<TARGET_OBJECTS:hog_sse4> $<TARGET_OBJECTS:hog_avx2> $<TARGET_OBJECTS:hog_avx512>)
-else()
-  add_library(fasthog SHARED ${HOG_SOURCES})
 endif()
 
 target_include_directories(fasthog PUBLIC ${HOG_INCLUDES})