Switch to a new, MSYS2 based build environment for Windows.

Highlights are:
- Since MSYS2 is much more unixlike than our old build environment we
  can remove most Windows specific hacks from the Makefile.
- MSYS2 has an package manager, the build environment can be updated
  by "pacman -Syu" just like an ordenary Arch Linux installation.
- Parallel builds are now working.
- git is integrated into the build envirment.
- zlib is now linked as a dynamic lib.

After this commit the old bild environment will no longer work! The
latest version must be downloaded and extracted to C:\MSYS2. Get it
here: https://deponie.yamagi.org/quake2/windows/build/

Makefile

@@ -198,17 +198,9 @@ endif
 
 # Extra CFLAGS for SDL
 ifeq ($(WITH_SDL2),yes)
-ifeq ($(YQ2_OSTYPE),Windows)
-SDLCFLAGS := $(shell /custom/bin/sdl2-config --cflags)
-else
 SDLCFLAGS := $(shell sdl2-config --cflags)
-endif
 else # not SDL2
-ifeq ($(YQ2_OSTYPE),Windows)
-SDLCFLAGS :=
-else
 SDLCFLAGS := $(shell sdl-config --cflags)
-endif
 endif # SDL2
 
 # ----------
@@ -233,7 +225,7 @@ INCLUDE := -I/usr/local/include
 else ifeq ($(YQ2_OSTYPE),OpenBSD)
 INCLUDE := -I/usr/local/include
 else ifeq ($(YQ2_OSTYPE),Windows)
-INCLUDE := -I/custom/include
+INCLUDE := -I/usr/include
 endif
 
 # ----------
@@ -251,7 +243,7 @@ LDFLAGS := -L/usr/local/lib -lm
 else ifeq ($(YQ2_OSTYPE),OpenBSD)
 LDFLAGS := -L/usr/local/lib -lm
 else ifeq ($(YQ2_OSTYPE),Windows)
-LDFLAGS := -L/custom/lib -lws2_32 -lwinmm
+LDFLAGS := -L/usr/lib -lws2_32 -lwinmm
 else ifeq ($(YQ2_OSTYPE), Darwin)
 LDFLAGS := $(OSX_ARCH) -lm
 endif
@@ -267,25 +259,19 @@ endif
 # ----------
 
 # Extra LDFLAGS for SDL
-ifeq ($(YQ2_OSTYPE), Windows)
+ifeq ($(YQ2_OSTYPE), Darwin)
-ifeq ($(WITH_SDL2),yes)
-SDLLDFLAGS := $(shell /custom/bin/sdl2-config --libs)
-else # not SDL2
-SDLLDFLAGS := -lSDL
-endif # SDL2
-else ifeq ($(YQ2_OSTYPE), Darwin)
 ifeq ($(WITH_SDL2),yes)
 SDLLDFLAGS := -lSDL2
 else # not SDL2
 SDLLDFLAGS := -lSDL -framework OpenGL -framework Cocoa
 endif # SDL2
-else # not Darwin/Win
+else # not Darwin
 ifeq ($(WITH_SDL2),yes)
 SDLLDFLAGS := $(shell sdl2-config --libs)
 else # not SDL2
 SDLLDFLAGS := $(shell sdl-config --libs)
 endif # SDL2
-endif # Darwin/Win
+endif # Darwin
 
 # ----------
 

README.md

@@ -207,9 +207,9 @@ libvorbis openal-soft`
 
 On Windows a MinGW environment is needed. A preinstalled environment with all
 dependencies can be found at http://deponie.yamagi.org/quake2/windows/build/
-Just extract it into C:\MinGW\ and start either the 32 bit or 64 bit version
+Just extract it into C:\MSYS2\ and start either the 32 bit or 64 bit version
-through *C:\MinGW\MSYS32* or *C:\MinGW\MSYS64*. With the preinstalled MinGW
+through *C:\MSYS2\msys32.exe* or *C:\MSYS2\msys64.exe*. With the preinstalled
-environment GNU Make is highly recommended, CMake requires further
+MinGW environment GNU Make is highly recommended, CMake requires further
 configuration. At this time Yamagi Quake II can't be compiled with Microsoft
 Visual Studio.
 
@@ -222,7 +222,6 @@ source directory and type *make*. After that copy everything from the release/
 directory to your Yamagi Quake II installation directory.
 
 For the addons download or clone their source, change into the source directory
-and type *make* (*make CC=gcc* on Windows). After the compilation finishes the
+and type *make*. After the compilation finishes the release/game.so is copied to
-release/game.so is copied to the corresponding directory in your Quake II
+the corresponding directory in your Quake II installation.
-installation.