Add includedirs for libsdl_xx (#644)

packages/l/libsdl_gfx/xmake.lua

@@ -29,6 +29,8 @@ package("libsdl_gfx")
 
     add_links("SDL2_gfx")
 
+    add_includedirs("include", "include/SDL2")
+
     on_install("windows", function(package)
         local vs = import("core.tool.toolchain").load("msvc"):config("vs")
         if tonumber(vs) < 2019 then

packages/l/libsdl_image/xmake.lua

@@ -23,6 +23,8 @@ package("libsdl_image")
 
     add_links("SDL2_image")
 
+    add_includedirs("include", "include/SDL2")
+
     on_install("windows", "mingw", function (package)
         local arch = package:arch()
         if package:is_plat("mingw") then

packages/l/libsdl_mixer/xmake.lua

@@ -23,6 +23,8 @@ package("libsdl_mixer")
 
     add_links("SDL2_mixer")
 
+    add_includedirs("include", "include/SDL2")
+
     on_install("windows", "mingw", function (package)
         local arch = package:arch()
         if package:is_plat("mingw") then

packages/l/libsdl_net/xmake.lua

@@ -23,6 +23,8 @@ package("libsdl_net")
 
     add_links("SDL2_net")
 
+    add_includedirs("include", "include/SDL2")
+
     on_install("windows", "mingw", function (package)
         local arch = package:arch()
         if package:is_plat("mingw") then

packages/l/libsdl_ttf/xmake.lua

@@ -26,6 +26,8 @@ package("libsdl_ttf")
 
     add_links("SDL2_ttf")
 
+    add_includedirs("include", "include/SDL2")
+
     on_install("windows", "mingw", function (package)
         local arch = package:arch()
         if package:is_plat("mingw") then