Fix macOS ARM build failing with make lite

OpenImageIO headers have a dependency on Imath headers when not on x86_64.

build_files/cmake/platform/platform_apple.cmake

@@ -154,9 +154,8 @@ if(WITH_FRIBIDI)
   find_package(Fribidi)
 endif()
 
-if(WITH_IMAGE_OPENEXR)
-  find_package(OpenEXR)
-endif()
+# Header dependency of required OpenImageIO.
+find_package(OpenEXR REQUIRED)
 add_bundled_libraries(openexr/lib)
 add_bundled_libraries(imath/lib)
 

intern/cycles/CMakeLists.txt

@@ -206,6 +206,7 @@ include_directories(
   SYSTEM
   ${BOOST_INCLUDE_DIR}
   ${OPENIMAGEIO_INCLUDE_DIRS}
+  ${IMATH_INCLUDE_DIRS}
   ${OPENEXR_INCLUDE_DIRS}
   ${PUGIXML_INCLUDE_DIR}
 )

source/blender/imbuf/intern/oiio/CMakeLists.txt

@@ -11,6 +11,7 @@ set(INC
 )
 
 set(INC_SYS
+  ${IMATH_INCLUDE_DIRS}
   ${OPENIMAGEIO_INCLUDE_DIRS}
 )