[freeimage] link openexr and imath with PRIVATE keyword

[Aostas]

Is your feature request related to a problem? Please describe.

Both openxr and imath have set INTERFACE_COMPILE_OPTIONS=/EHsc, causing my program to be forced to set /EHsc when linking with freeimage, and I cannot change it to /EHa.
Usually, I can change it by using the following method

add_compile_options(/EHa)
STRING(REPLACE "/EHsc" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})

But, INTERFACE_COMPILE_OPTIONS will be set after compile_options, causing the previously set /EHa option to be overridden.

I can work around this issue by using the following method, but I don't think it's a good approach.

find_package(freeimage CONFIG REQUIRED)
add_library(freeimage_wrapper STATIC wrapper/wrapper.cc) # wapper.cc is an empty source file
target_link_libraries(freeimage_wrapper PRIVATE freeimage::FreeImage)
target_link_libraries(${PROJECT_NAME} PRIVATE freeimage_wrapper)

Proposed solution

Link openexr and imath with PRIVATE keyword

Describe alternatives you've considered

No response

Additional context

No response