Modified for CMake 3.12 to drop FOLLOW_SYMLINKS in file(GLOB ...).

Obtained via:	https://springrts.com/mantis/view.php?id=4679

From 9e0db5f602407de4e7875ca85761b41782c1bb9c Mon Sep 17 00:00:00 2001
From: Johan Rehnberg <cleanrock@gmail.com>
Date: Wed, 31 Dec 2014 11:35:19 +0100
Subject: [PATCH] fix GetListOfSubModules to support GLOB returning both "//"
 and "/"

I needed this when building on archlinux with cmake 3.1.0 where GLOB returns "/"

...

--- rts/build/cmake/Util.cmake.orig	2014-10-07 20:09:51 UTC
+++ rts/build/cmake/Util.cmake
@@ -165,11 +165,12 @@ EndFunction (MakeGlobal)
 
 # Find all CMakeLists.txt files in sub-directories
 Macro    (GetListOfSubModules list_var)
-	File(GLOB ${list_var} RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" FOLLOW_SYMLINKS "${CMAKE_CURRENT_SOURCE_DIR}/*/CMakeLists.txt")
-
+	File(GLOB ${list_var} RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/*/CMakeLists.txt")
 	# Strip away the "/CMakeLists.txt" parts, so we end up with just a list of dirs,
 	# for example: AAI;RAI;KAIK
-	String(REPLACE "//CMakeLists.txt" "" ${list_var} "${${list_var}}")
+	# GLOB can prefix with "//" or "/" (perhaps changed in cmake 3.1.0), this double replace will support both "//" and "/"
+	String(REPLACE "/CMakeLists.txt" "" ${list_var} "${${list_var}}")
+	String(REPLACE "/" "" ${list_var} "${${list_var}}")
 EndMacro (GetListOfSubModules list_var)