Include correct macro to check for files

Author: mysy00

source/compiler/CMakeLists.txt

@@ -18,7 +18,7 @@ project(pawnc
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/../../cmake)
 #==============================================================================#
-include(CheckIncludeFile)
+include(CheckIncludeFiles)
 include(CheckFunctionExists)
 
 # check for optional include files