Merge pull request #3 from drodin/hunter-0.12

fix unrelocatable cmake config

Author: rbsheth

CMakeLists.txt

@@ -20,12 +20,13 @@ if(HUNTER_ENABLED)
     find_package(libogg CONFIG REQUIRED)
     set(OGG_LIBRARY libogg::ogg)
     get_target_property(OGG_INCLUDE_DIR libogg::ogg INTERFACE_INCLUDE_DIRECTORIES)
+    set(OGG_INCLUDE_DIR $<BUILD_INTERFACE:${OGG_INCLUDE_DIR}>)
 
     hunter_add_package(Opus)
     find_package(Opus CONFIG REQUIRED)
     set(OPUS_LIBRARY Opus::opus)
     get_target_property(OPUS_INCLUDE_DIR Opus::opus INTERFACE_INCLUDE_DIRECTORIES)
-    set(OPUS_INCLUDE_DIR ${OPUS_INCLUDE_DIR} ${OPUS_INCLUDE_DIR}/opus)
+    set(OPUS_INCLUDE_DIR $<BUILD_INTERFACE:${OPUS_INCLUDE_DIR}> $<BUILD_INTERFACE:${OPUS_INCLUDE_DIR}/opus> $<INSTALL_INTERFACE:include/opus>)
 else()
     find_path(OGG_INCLUDE_DIR ogg/ogg.h)
     find_library(OGG_LIBRARY ogg)