ANDROID: clean build fix

Without the "param" file, the placed new one had the mistake of
unescaped $VAR parts which caused problems. Since I always had my own
param file, I haven't noticed the problem till now with a new branch
without the param file.

Author: lgblgblgb

build/configure/sdl2-config-for-android

@@ -17,10 +17,10 @@ if [ ! -s $PARAM_FILE ]; then
 # This part only writes file sdl2-config-for-android.params if it's not
 # there yet, but you can customize it then, there.
 cat > $PARAM_FILE << EOF
-SDL_BASE=$HOME/android/SDL-release-2.28.5
+SDL_BASE=\$HOME/android/SDL-release-2.28.5
 SYS_ARCH=arm64-v8a
-NDK_CC=$HOME/android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android31-clang
-CFLAGS_SDL="-I$SDL_BASE/include/ -D_REENTRANT -Dmain=SDL_main"
+NDK_CC=\$HOME/android/Sdk/ndk/23.1.7779620/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android31-clang
+CFLAGS_SDL="-I\$SDL_BASE/include/ -D_REENTRANT -Dmain=SDL_main"
 CFLAGS_ANDROID="-fPIC -DANDROID"
 CFLAGS_ARCH=""
 LDFLAGS_SDL="-L\$SDL_BASE/build/android/lib/arm64-v8a/ -lSDL2"