Disable OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX when building on arm64 macOS

For some reason, the compile check for detecting inline AVX support does
not correctly disable OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX when building
on arm64 macOS using clang (the check does work correctly on aarch64 Linux
using gcc). This change hardcodes OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX to
always be false when the system is detected as arm64 macOS. This change
is necessary to allow building on arm64 macOS to complete successfully.

Signed-off-by: Yining Karl Li <betajippity@gmail.com>

OpenEXR/config/CMakeLists.txt

@@ -47,6 +47,9 @@ set(OPENEXR_IMF_HAVE_COMPLETE_IOMANIP TRUE)
 
 if(APPLE)
   set(OPENEXR_IMF_HAVE_DARWIN TRUE)
+  if (${CMAKE_OSX_ARCHITECTURES} MATCHES arm64)
+    set(OPENEXR_IMF_HAVE_GCC_INLINE_ASM_AVX FALSE)
+  endif()
 endif()
 
 configure_file(OpenEXRConfig.h.in_cmake ${CMAKE_CURRENT_BINARY_DIR}/OpenEXRConfig.h)