Set EXR_DEFLATE_LIB properly for static linking

This leads OpenEXRCore/CMakeLists.txt to do:

    target_link_libraries(OpenEXRCore PUBLIC libdeflate)

instead of:

    target_link_libraries(OpenEXRCore PUBLIC PkgConfig::deflate)

which is not recognized. With a target link library of
`PkgConfig::deflate`, the static build of the OpenEXR libraries builds
successfully, but configuring an application against those static
libraries fails, saying it can't find `PkgConfig::deflate`.

Signed-off-by: Cary Phillips <cary@ilm.com>

cmake/OpenEXRSetup.cmake

@@ -163,6 +163,9 @@ if(NOT OPENEXR_FORCE_INTERNAL_DEFLATE)
   include(FindPkgConfig)
   pkg_check_modules(deflate IMPORTED_TARGET GLOBAL libdeflate)
   set(CMAKE_IGNORE_PATH)
+  if (deflate_FOUND)
+    message(STATUS "Using libdeflate from ${deflate_LINK_LIBRARIES}")
+  endif()
 endif()
 
 if(NOT TARGET PkgConfig::deflate AND NOT deflate_FOUND)
@@ -212,7 +215,8 @@ if(NOT TARGET PkgConfig::deflate AND NOT deflate_FOUND)
   set(EXR_DEFLATE_LIB)
 else()
   set(EXR_DEFLATE_INCLUDE_DIR)
-  set(EXR_DEFLATE_LIB PkgConfig::deflate)
+  set(EXR_DEFLATE_LIB ${deflate_LIBRARIES})
+#  set(EXR_DEFLATE_LIB PkgConfig::deflate)
   set(EXR_DEFLATE_SOURCES)
 endif()