fix: Improve MSYS2 platform detection in makefile

- Use MSYSTEM environment variable instead of uname for MSYS2 detection
- Fix incorrect macOS build type being used on Windows
- Ensure proper include paths for SDL2 headers in MSYS2

Author: ffbsoffa

source/makefile

@@ -48,10 +48,14 @@ UNAME_S := $(shell uname -s)
 UNAME_M := $(shell uname -m)
 
 # Platform detection and configuration
-ifneq (,$(findstring NT-,$(UNAME_S)))
+ifneq (,$(findstring MINGW,$(MSYSTEM)))
     # Windows (MSYS2/MinGW) configuration
     PLATFORM = windows
     BUILD_TYPE = Windows (SDL2/MinGW)
+else ifneq (,$(findstring MINGW,$(shell uname -s)))
+    # Windows (MSYS2/MinGW) configuration through other environments
+    PLATFORM = windows
+    BUILD_TYPE = Windows (SDL2/MinGW)
     ARCH_FLAGS =
 
     # Windows-specific paths and flags