Makefile: Allow specifying SDL_LIBRARIES to link, this helps with SDL3

examples/Makefile

@@ -87,6 +87,8 @@ USE_EXTERNAL_GLFW     ?= FALSE
 # WARNING: Library is not included in raylib, it MUST be configured by users
 SDL_INCLUDE_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2/include
 SDL_LIBRARY_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2/lib
+SDL_LIBRARIES         ?= -lSDL2 -lSDL2main
+
 
 # Use Wayland display server protocol on Linux desktop (by default it uses X11 windowing system)
 # NOTE: This variable is only used for PLATFORM_OS: LINUX
@@ -415,12 +417,12 @@ endif
 ifeq ($(TARGET_PLATFORM),PLATFORM_DESKTOP_SDL)
     ifeq ($(PLATFORM_OS),WINDOWS)
         # Libraries for Windows desktop compilation
-        LDLIBS = -lraylib -lSDL2 -lSDL2main -lopengl32 -lgdi32
+        LDLIBS = -lraylib $(SDL_LIBRARIES) -lopengl32 -lgdi32
     endif
     ifeq ($(PLATFORM_OS),LINUX)
         # Libraries for Debian GNU/Linux desktop compiling
         # NOTE: Required packages: libegl1-mesa-dev
-        LDLIBS = -lraylib -lSDL2 -lSDL2main -lGL -lm -lpthread -ldl -lrt
+        LDLIBS = -lraylib $(SDL_LIBRARIES) -lGL -lm -lpthread -ldl -lrt
 
         # On X11 requires also below libraries
         LDLIBS += -lX11

src/Makefile

@@ -118,6 +118,8 @@ GLFW_LINUX_ENABLE_X11      ?= TRUE
 # WARNING: Library is not included in raylib, it MUST be configured by users
 SDL_INCLUDE_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2/include
 SDL_LIBRARY_PATH      ?= $(RAYLIB_SRC_PATH)/external/SDL2/lib
+SDL_LIBRARIES         ?= -lSDL2 -lSDL2main
+
 
 # Determine if the file has root access (only required to install raylib)
 # "whoami" prints the name of the user that calls him (so, if it is the root user, "whoami" prints "root")
@@ -586,7 +588,7 @@ ifeq ($(TARGET_PLATFORM),PLATFORM_DESKTOP_SDL)
             LDLIBS += -lX11
         endif
     endif
-    LDLIBS += -lSDL2 -lSDL2main
+    LDLIBS += $(SDL_LIBRARIES)
 endif
 ifeq ($(TARGET_PLATFORM),PLATFORM_DESKTOP_RGFW)
     ifeq ($(PLATFORM_OS),WINDOWS)