[externals] remove vulkan stuff

Signed-off-by: crueter <crueter@eden-emu.dev>

.gitmodules

@@ -4,9 +4,6 @@
 [submodule "libusb"]
 	path = externals/libusb/libusb
 	url = https://github.com/libusb/libusb.git
-[submodule "Vulkan-Headers"]
-	path = externals/Vulkan-Headers
-	url = https://github.com/KhronosGroup/Vulkan-Headers.git
 [submodule "xbyak"]
 	path = externals/xbyak
 	url = https://github.com/Lizzie841/xbyak.git
@@ -25,9 +22,6 @@
 [submodule "VulkanMemoryAllocator"]
 	path = externals/VulkanMemoryAllocator
 	url = https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator.git
-[submodule "Vulkan-Utility-Libraries"]
-	path = externals/Vulkan-Utility-Libraries
-	url = https://github.com/KhronosGroup/Vulkan-Utility-Libraries.git
 [submodule "externals/boost-headers"]
 	path = externals/boost-headers
 	url = https://github.com/boostorg/headers.git

externals/CMakeLists.txt

@@ -175,7 +175,6 @@ if (YUZU_USE_EXTERNAL_VULKAN_UTILITY_LIBRARIES)
     )
 endif()
 
-
 # SPIRV-Tools
 if (YUZU_USE_EXTERNAL_VULKAN_SPIRV_TOOLS)
     set(SPIRV_SKIP_EXECUTABLES ON)

externals/Vulkan-Headers

@@ -1 +0,0 @@
-Subproject commit 89268a6d17fc87003b209a1422c17ab288be99a0

externals/Vulkan-Utility-Libraries

@@ -1 +0,0 @@
-Subproject commit df2e3581520f36776cd42b9fec3ec4a51ab878ef