cmake: disable vulkan by default for Solaris

CMakeLists.txt

@@ -283,8 +283,11 @@ if(COMMAND SDL_Preseed_CMakeCache)
   set(SDL_PRESEED_AVAILABLE ON)
 endif()
 
+set(SDL_VULKAN_DEFAULT ON)
+
 set(SDL_X11_XRANDR_DEFAULT ON)
 if(SOLARIS)
+  set(SDL_VULKAN_DEFAULT OFF)
   set(SDL_X11_XRANDR_DEFAULT OFF)
 endif()
 
@@ -373,7 +376,7 @@ dep_option(SDL_RENDER_D3D12        "Enable the Direct3D 12 render driver" ON "SD
 dep_option(SDL_RENDER_METAL        "Enable the Metal render driver" ON "SDL_RENDER;APPLE" OFF)
 dep_option(SDL_RENDER_GPU          "Enable the SDL_GPU render driver" ON "SDL_RENDER;SDL_GPU" OFF)
 dep_option(SDL_VIVANTE             "Use Vivante EGL video driver" ON "${UNIX_SYS};SDL_CPU_ARM32" OFF)
-dep_option(SDL_VULKAN              "Enable Vulkan support" ON "SDL_VIDEO;ANDROID OR APPLE OR LINUX OR FREEBSD OR OPENBSD OR WINDOWS" OFF)
+dep_option(SDL_VULKAN              "Enable Vulkan support" "${SDL_VULKAN_DEFAULT}" "SDL_VIDEO;ANDROID OR APPLE OR LINUX OR FREEBSD OR OPENBSD OR WINDOWS" OFF)
 dep_option(SDL_RENDER_VULKAN       "Enable the Vulkan render driver" ON "SDL_RENDER;SDL_VULKAN" OFF)
 dep_option(SDL_METAL               "Enable Metal support" ON "APPLE" OFF)
 set_option(SDL_OPENVR              "Use OpenVR video driver" OFF)