SDL: Don't provide the SDL3 header path

SDL Commits
1 
From bbe2e012a299e15218abf76fc7c33faa47598f23 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 31 Aug 2023 11:41:37 -0700
Subject: [PATCH] Don't provide the SDL3 header path

The recommended way to include SDL.h is #include <SDL3/SDL.h>, and having both paths available was confusing for people trying to port to SDL3.

Thanks for the feedback!
https://github.com/exult/exult/issues/379#issuecomment-1701066992
---
 cmake/sdl3.pc.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/sdl3.pc.in b/cmake/sdl3.pc.in
index 5069c90d6c15..bfc2afffeb31 100644
--- a/cmake/sdl3.pc.in
+++ b/cmake/sdl3.pc.in
@@ -10,4 +10,4 @@ Version: @PROJECT_VERSION@
 Requires.private: @SDL_PC_PRIVATE_REQUIRES@
 Conflicts:
 Libs: -L${libdir} @SDL_RLD_FLAGS@ @SDL_PC_LIBS@ @SDL_PC_SECTION_LIBS_PRIVATE@ @SDL_PC_STATIC_LIBS@
-Cflags: -I${includedir} -I${includedir}/SDL3 @SDL_PC_CFLAGS@
+Cflags: -I${includedir} @SDL_PC_CFLAGS@