Include 3rd-party libs as system headers

Now, the compiler will only report errors in our code and not in any of
these headers.

CMakeLists.txt

@@ -27,8 +27,7 @@ if(RENDERER IN_LIST gl_renderers)
 	set(using_gl true)
 endif()
 
-# Supported on Linux, FreeBSD, NetBSD?
-cmake_dependent_option(USE_GLVND "Link against modern GLVND ABIs" ON "using_gl;UNIX;NOT APPLE;NOT EMSCRIPTEN" OFF)
+cmake_dependent_option(USE_GLVND "Link against modern GLVND ABIs" OFF "using_gl;LINUX" ON)
 cmake_dependent_option(MINIMAL_BUNDLE "Do not include music/movies for web builds" OFF "EMSCRIPTEN" OFF)
 
 find_package(OpenGL)
@@ -95,18 +94,14 @@ set(common_src
 	packaging/windows/wipeout.rc
 )
 
-set(compile_opts
-	$<$<CXX_COMPILER_ID:MSVC>:/W4>
-	$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wall -Wextra -Wstrict-prototypes>
-)
-set_source_files_properties("${common_src}"
-	PROPERTIES COMPILE_FLAGS "${compile_opts}"
-)
-
 add_executable(wipeout WIN32 ${common_src})
 set_property(TARGET wipeout PROPERTY C_STANDARD 11)
 target_include_directories(wipeout PRIVATE src)
-target_compile_options(wipeout PRIVATE ${compile_opts})
+target_include_directories(wipeout SYSTEM PRIVATE src/libs)
+target_compile_options(wipeout PRIVATE
+	$<$<CXX_COMPILER_ID:MSVC>:/W4>
+	$<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wall -Wextra>
+)
 
 if(WIN32)
 	target_compile_definitions(wipeout PRIVATE

src/platform_sokol.c

@@ -14,9 +14,9 @@
 #endif
 
 #define SOKOL_IMPL
-#include "libs/sokol_audio.h"
-#include "libs/sokol_time.h"
-#include "libs/sokol_app.h"
+#include <sokol_audio.h>
+#include <sokol_time.h>
+#include <sokol_app.h>
 #include "input.h"
 
 // FIXME: we should figure out the actual path where the executabe resides,

src/render_gl.c

@@ -23,7 +23,7 @@
 
 
 
-#include "libs/stb_image_write.h"
+#include <stb_image_write.h>
 
 #include "system.h"
 #include "render.h"

src/wipeout/image.c

@@ -17,7 +17,7 @@
 
 
 #define STB_IMAGE_WRITE_IMPLEMENTATION
-#include "../libs/stb_image_write.h"
+#include <stb_image_write.h>
 
 
 #define TIM_TYPE_PALETTED_4_BPP 0x08

src/wipeout/intro.c

@@ -19,7 +19,7 @@ void *realloc_dummmy(void *p, size_t sz) {
 #define PLM_MALLOC mem_bump
 #define PLM_FREE free_dummmy
 #define PLM_REALLOC realloc_dummmy
-#include "../libs/pl_mpeg.h"
+#include <pl_mpeg.h>
 
 #define INTRO_AUDIO_BUFFER_LEN (64 * 1024)
 

src/wipeout/sfx.c

@@ -7,7 +7,7 @@
 
 #define QOA_IMPLEMENTATION
 #define QOA_NO_STDIO
-#include "../libs/qoa.h"
+#include <qoa.h>
 
 typedef struct {
 	int16_t *samples;