Cleaned up Makefile and ignored clean target del for Windows

Makefile

@@ -1,29 +1,33 @@
 # Set general macros
 buildFile = build/app
-libGenDirectory = src
 
 # Check for Windows
 ifeq ($(OS), Windows_NT)
-	# Set Windows compile macros
+	# Set Windows macros
 	platform = Windows
 	compiler = g++
 	options = -pthread -lopengl32 -lgdi32 -lwinmm -mwindows
+	THEN = &&
 else
 	# Check for MacOS/Linux
 	UNAMEOS = $(shell uname)
 	ifeq ($(UNAMEOS), Linux)
-		# Set Linux compile macros
+		# Set Linux macros
 		platform = Linux
 		compiler = g++
 		options = -l GL -l m -l pthread -l dl -l rt -l X11
 		libGenDirectory = # Empty
 	endif
 	ifeq ($(UNAMEOS), Darwin)
-		# Set macOS compile macros
+		# Set macOS macros
 		platform = macOS
 		compiler = clang++
 		options = -framework CoreVideo -framework IOKit -framework Cocoa -framework GLUT -framework OpenGL
+		libGenDirectory = src
 	endif
+
+	# Set UNIX macros
+	THEN = ;
 endif
 
 # Explicitly set compiler to platform default if unset
@@ -48,24 +52,21 @@ submodules:
 include: submodules
 ifeq ($(platform), Windows)
 	-mkdir .\include
-	-robocopy "vendor\raylib-cpp\vendor\raylib\src" "include" raylib.h
-	-robocopy "vendor\raylib-cpp\vendor\raylib\src" "include" raymath.h
+	-robocopy "vendor\raylib-cpp\vendor\raylib\src" "include" raylib.h raymath.h
 	-robocopy "vendor\raylib-cpp\include" "include" *.hpp
 else
 	mkdir -p include
-	cp vendor/raylib-cpp/vendor/raylib/src/raylib.h include/raylib.h
-	cp vendor/raylib-cpp/vendor/raylib/src/raymath.h include/raymath.h
+	cp vendor/raylib-cpp/vendor/raylib/src/{raylib.h,raymath.h} include
 	cp vendor/raylib-cpp/include/*.hpp include
 endif
 
 # Build the raylib static library file and copy it into lib
 lib: submodules
+	cd vendor/raylib-cpp/vendor/raylib/src $(THEN) "$(MAKE)" PLATFORM=PLATFORM_DESKTOP
 ifeq ($(platform), Windows)
-	cd vendor/raylib-cpp/vendor/raylib/src && "$(MAKE)" PLATFORM=PLATFORM_DESKTOP
 	-mkdir lib\$(platform)
 	-robocopy "vendor\raylib-cpp\vendor\raylib\src" "lib\Windows" libraylib.a
 else
-	cd vendor/raylib-cpp/vendor/raylib/src; $(MAKE) PLATFORM=PLATFORM_DESKTOP
 	mkdir -p lib/$(platform)
 	cp vendor/raylib-cpp/vendor/raylib/$(libGenDirectory)/libraylib.a lib/$(platform)/libraylib.a
 endif
@@ -89,9 +90,7 @@ execute:
 # Clean up all relevant files
 clean:
 ifeq ($(platform), Windows)
-	dir
-	dir build
-	erase build
+	-del build\app.exe
 else
 	rm $(buildFile)
 endif