Adjust include dir to be absolute

Signed-off-by: Tobias Frisch <tfrisch@uni-koblenz.de>

modules/shader_compiler/config/JSON-C.cmake

@@ -4,8 +4,8 @@ use_git_submodule("${vkcv_shader_compiler_lib_path}/json-c" json_c_status)
 if (${json_c_status})
 	add_subdirectory(${vkcv_shader_compiler_lib}/json-c)
 
-	set(JSON_C_INCLUDE_DIR ${vkcv_shader_compiler_lib})
+	set(JSON_C_INCLUDE_DIR ${vkcv_shader_compiler_lib_path})
 	
 	list(APPEND vkcv_shader_compiler_libraries json-c)
-	list(APPEND vkcv_shader_compiler_includes ${JSON_C_INCLUDE_DIR})
+	list(APPEND vkcv_shader_compiler_includes ${vkcv_shader_compiler_lib})
 endif ()