Officially remove Windows support

Author: Popax21

README.md

@@ -7,8 +7,14 @@ generic patches, without the need for any map-specific support scripts, as well
 as by only making the minimum number of changes required for the maps to be
 playable.
 
-Currently, the plugin only works on Linux, however Windows support is planned to
-be added eventually.
+Currently, the plugin only works on Linux. Windows support is theoretically
+possible (the plugin foundation code does contain initial untested Windows
+support code), however as the Windows release of Portal 2 was compiled with an
+entirely different compiler (MSVC vs GCC), all patches would have to be adjusted
+to work on Windows. If you want to help out by doing this yourself, please let
+me know - I will gladly assist you throughout the process, and merge your work
+once you finish. To get started, see `plugin/src/anchors.cpp` and the offsets /
+orig-sequences in the actual patches.
 
 Patches include:
 - removing the player cap from all multiplayer game session

plugin/Makefile

@@ -15,9 +15,7 @@ SDKSTATLIB := tier1.a mathlib.a tier2.a
 SDKSTATLIB := $(addprefix $(SDK)/mp/src/lib/public/linux32/, $(SDKSTATLIB))
 
 ifeq ($(OS), Windows_NT)
-	# Don't tell it that this is GCC on Windows, otherwise the platform will complain
-	# Fake being MSVC instead
-	OSFLAGS := -DWIN32 -D_WIN32 -D_MSC_VER -D_MSC_FULL_VER=180030723 -Isystem compat_inc
+	$(error Windows is not yet supported - you can use this Makefile as a baseline for creating an MSVC .vcxproj (please PR it if you do!))
 else
 	OSFLAGS := -DPOSIX -D_POSIX -DLINUX -D_LINUX -DGNUC -DCOMPILER_GCC 
 endif