clean up submodule references

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "cmake/external/rpavlik-cmake-modules"]
-	path = cmake/external/rpavlik-cmake-modules
-	url = https://github.com/rpavlik/cmake-modules.git
 [submodule "lib/libRocket"]
 	path = lib/libRocket
 	url = https://github.com/scp-fs2open/libRocket.git

CMakeLists.txt

@@ -48,14 +48,12 @@ endif()
 PROJECT(FS2_Open LANGUAGES ${FSO_LANGUAGES})
 
 # Check if the external modules exists
-IF(NOT IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/cmake/external/rpavlik-cmake-modules/launcher-templates")
+IF(NOT IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/lib/libRocket/Build")
 	message(FATAL_ERROR "External submodules could not be found. Please make sure you have updated your submodules.")
 endif()
 
 LIST(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 LIST(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/finder")
-LIST(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/external/rpavlik-cmake-modules")
-LIST(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/external/cotire")
 
 # this must be set before include(toolchain)
 if(WIN32 AND CMAKE_SIZEOF_VOID_P EQUAL 4)
@@ -122,8 +120,6 @@ SET(FSO_RUN_ARGUMENTS "" CACHE STRING "Additional arguments passed to a generate
 
 option(FSO_INSTALL_DEBUG_FILES "Install some debug files (currently only PDB files on windows)" OFF)
 
-option(ENABLE_COTIRE "Enable cotire for faster compilation. Enabled by default." ON)
-
 option(FSO_RELEASE_LOGGING "Enable logging output for release builds" OFF)
 
 OPTION(FSO_BUILD_WITH_FFMPEG "Enable the usage of FFmpeg for sound and custscenes" ON)
@@ -172,7 +168,6 @@ MARK_AS_ADVANCED(FORCE FSO_USE_LUAJIT)
 MARK_AS_ADVANCED(FORCE FSO_DEVELOPMENT_MODE)
 MARK_AS_ADVANCED(FORCE FSO_FATAL_WARNINGS)
 mark_as_advanced(FORCE FSO_INSTALL_DEBUG_FILES)
-mark_as_advanced(FORCE ENABLE_COTIRE)
 mark_as_advanced(FORCE FSO_RELEASE_LOGGING)
 mark_as_advanced(FORCE FSO_BUILD_WITH_FFMPEG)
 mark_as_advanced(FORCE FSO_BUILD_WITH_DISCORD)

cmake/CleanDirectoryList.cmake

@@ -0,0 +1,48 @@
+# - Removes duplicate entries and non-directories from a provided list
+#
+#  clean_directory_list(<listvar> [<additional list items>...])
+#
+# Requires CMake 2.6 or newer (uses the 'function' command)
+#
+# Original Author:
+# 2009-2010 Ryan Pavlik <rpavlik@iastate.edu> <abiryan@ryand.net>
+# http://academic.cleardefinition.com
+# Iowa State University HCI Graduate Program/VRAC
+#
+# Copyright Iowa State University 2009-2010.
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+if(__clean_directory_list)
+	return()
+endif()
+set(__clean_directory_list YES)
+
+function(clean_directory_list _var)
+	# combine variable's current value with additional list items
+	set(_in ${${_var}} ${ARGN})
+
+	if(_in)
+		# Initial list cleaning
+		list(REMOVE_DUPLICATES _in)
+
+		# Grab the absolute path of each actual directory
+		set(_out)
+		foreach(_dir ${_in})
+			if(IS_DIRECTORY "${_dir}")
+				get_filename_component(_dir "${_dir}" ABSOLUTE)
+				file(TO_CMAKE_PATH "${_dir}" _dir)
+				list(APPEND _out "${_dir}")
+			endif()
+		endforeach()
+
+		if(_out)
+			# Clean up the output list now
+			list(REMOVE_DUPLICATES _out)
+		endif()
+
+		# return _out
+		set(${_var} "${_out}" PARENT_SCOPE)
+	endif()
+endfunction()