Always check for x86-ish with the same regex. (#93)

On line 68, and in most places, "intel-like" is checked with `i[3-6]86|AMD64|x86(_64)?`, but in these 3 places the (_x64)? was missing.

First reported as microsoft/vcpkg#24713

CMakeLists.txt

@@ -324,7 +324,7 @@ ENDIF()
 # ---[ cpuinfo mock library and mock tests
 IF(CPUINFO_SUPPORTED_PLATFORM AND CPUINFO_BUILD_MOCK_TESTS)
   SET(CPUINFO_MOCK_SRCS "${CPUINFO_SRCS}")
-  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86_64)$")
+  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86(_64)?)$")
     LIST(APPEND CPUINFO_MOCK_SRCS src/x86/mockcpuid.c)
   ENDIF()
   IF(CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "Android")
@@ -768,7 +768,7 @@ IF(CPUINFO_SUPPORTED_PLATFORM AND CPUINFO_BUILD_UNIT_TESTS)
     ADD_TEST(get-current-test get-current-test)
   ENDIF()
 
-  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86_64)$")
+  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86(_64)?)$")
     ADD_EXECUTABLE(brand-string-test test/name/brand-string.cc)
     CPUINFO_TARGET_ENABLE_CXX11(brand-string-test)
     CPUINFO_TARGET_RUNTIME_LIBRARY(brand-string-test)
@@ -835,7 +835,7 @@ IF(CPUINFO_SUPPORTED_PLATFORM AND CPUINFO_BUILD_TOOLS)
     CPUINFO_TARGET_RUNTIME_LIBRARY(cpuinfo-dump)
   ENDIF()
 
-  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86_64)$")
+  IF(CPUINFO_TARGET_PROCESSOR MATCHES "^(i[3-6]86|AMD64|x86(_64)?)$")
     ADD_EXECUTABLE(cpuid-dump tools/cpuid-dump.c)
     CPUINFO_TARGET_ENABLE_C99(cpuid-dump)
     CPUINFO_TARGET_RUNTIME_LIBRARY(cpuid-dump)
@@ -874,4 +874,3 @@ IF(CPUINFO_BUILD_PKG_CONFIG)
   DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 
 ENDIF()
-