Do not overwrite COMPILE_DEFITIONS with set_properties

Author: JohanMabille

CMakeLists.txt

@@ -282,8 +282,8 @@ else ()
         PROPERTIES
         VERSION ${SPARROW_BINARY_VERSION}
         SOVERSION ${SPARROW_BINARY_CURRENT}
-        COMPILE_DEFINITIONS "SPARROW_EXPORTS"
     )
+    target_compile_definitions(sparrow PRIVATE SPARROW_EXPORTS)
 endif ()
 target_include_directories(sparrow PUBLIC
     $<BUILD_INTERFACE:${SPARROW_INCLUDE_DIR}>