Fix SSE detection on non-AVX CPUs (#135)

Fixes #4. This is based on #115 with a few modifications:
 - Removed use of __builtin_cpu_supports since it relies on cpuid and doesn't improve on the current situation,
 - Added detection for all of sse, sse2, sse3, ssse3, sse4_1 and sse4_2,
 - Added tests for Atom, Nehalem, and P3 processors,

Thx to @gadoofou87 for providing the original PR.
It also removes the need for #92

* Fix SSE detection on non-AVX CPUs
* Fixes typo
* Mock OSX sysctlbyname in tests
* Also update other tests
* FakeCpu is reset between each tests
* Fix conflicting name on Windows
* Disable pre AVX cpu sse detection tests on Windows
* Guard OS specific code with macros
* Fix missing import for tests
* Fix wrong function prototype
* Fix wrong mocking of P3 on Windows
* Completely guard OS specific parts in x86 tests
* Store DWORD instead unsigned long for x86 tests

CMakeLists.txt

@@ -91,6 +91,11 @@ macro(add_cpu_features_headers_and_sources HDRS_LIST_NAME SRCS_LIST_NAME)
   endif()
 endmacro()
 
+if(UNIX AND PROCESSOR_IS_X86)
+  check_include_file(sys/utsname.h HAVE_UTSNAME_H)
+endif()
+
+
 #
 # library : utils
 #
@@ -148,6 +153,14 @@ set_property(TARGET cpu_features PROPERTY POSITION_INDEPENDENT_CODE ${BUILD_PIC}
 target_include_directories(cpu_features
   PUBLIC $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/cpu_features>
 )
+if(PROCESSOR_IS_X86)
+  if(HAVE_UTSNAME_H)
+    target_compile_definitions(cpu_features PRIVATE HAVE_UTSNAME_H)
+  endif()
+  if(APPLE)
+    target_compile_definitions(cpu_features PRIVATE HAVE_SYSCTLBYNAME)
+  endif()
+endif()
 add_library(CpuFeature::cpu_features ALIAS cpu_features)
 
 #