[Build] Convert build system to raw cmake and remove premake layer

src/xenia/gpu/CMakeLists.txt

@@ -0,0 +1,30 @@
+add_library(xenia-gpu STATIC)
+xe_platform_sources(xenia-gpu ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(xenia-gpu PRIVATE
+  ${PROJECT_SOURCE_DIR}/third_party/Vulkan-Headers/include
+  ${PROJECT_SOURCE_DIR}/third_party/glslang
+)
+target_link_libraries(xenia-gpu PUBLIC dxbc fmt glslang-spirv snappy xxhash xenia-base xenia-ui)
+xe_target_defaults(xenia-gpu)
+
+if(XENIA_BUILD_MISC)
+  # Shader compiler tool
+  add_executable(xenia-gpu-shader-compiler
+    ${CMAKE_CURRENT_SOURCE_DIR}/shader_compiler_main.cc
+  )
+  if(WIN32)
+    target_sources(xenia-gpu-shader-compiler PRIVATE
+      ${PROJECT_SOURCE_DIR}/src/xenia/base/console_app_main_win.cc)
+  else()
+    target_sources(xenia-gpu-shader-compiler PRIVATE
+      ${PROJECT_SOURCE_DIR}/src/xenia/base/console_app_main_posix.cc)
+  endif()
+  target_include_directories(xenia-gpu-shader-compiler PRIVATE
+    ${PROJECT_SOURCE_DIR}/third_party/Vulkan-Headers/include
+    ${PROJECT_SOURCE_DIR}/third_party/glslang
+  )
+  target_link_libraries(xenia-gpu-shader-compiler PRIVATE
+    dxbc fmt glslang-spirv snappy xenia-base xenia-gpu xenia-ui xenia-ui-vulkan
+  )
+  xe_target_defaults(xenia-gpu-shader-compiler)
+endif()