use relative paths for install

This is intended to make the installed package relocatable.

Author: kevinAlbs

CMakeLists.txt

@@ -55,14 +55,14 @@ set_target_properties (utf8proc PROPERTIES
 
 if (UTF8PROC_INSTALL)
   include(GNUInstallDirs)
-  install(FILES utf8proc.h DESTINATION "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
+  install(FILES utf8proc.h DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
   install(TARGETS utf8proc
-    ARCHIVE DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-    LIBRARY DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}"
-    RUNTIME DESTINATION "${CMAKE_INSTALL_FULL_BINDIR}"
+    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
+    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
   )
   configure_file(libutf8proc.pc.cmakein libutf8proc.pc @ONLY)
-  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libutf8proc.pc" DESTINATION "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig")
+  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libutf8proc.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
 endif()
 
 if(UTF8PROC_ENABLE_TESTING)