Add header dependencies that prevented linux build

There were several files with dependancies on vector and cmath that
caused compiler errors under linux. In addition, there was a printf
formatting error that threw a compiler error as well

src/xenia/gpu/command_processor.h

@@ -240,3 +240,4 @@ class CommandProcessor {
 }  // namespace xe
 
 #endif  // XENIA_GPU_COMMAND_PROCESSOR_H_
+

src/xenia/gpu/gl4/gl4_shader_cache.cc

@@ -184,4 +184,4 @@ GL4Shader* GL4ShaderCache::FindCachedShader(ShaderType shader_type,
 
 }  // namespace gl4
 }  // namespace gpu
-}  // namespace xe
+}  // namespace xe

src/xenia/gpu/gl4/gl4_shader_cache.h

@@ -11,6 +11,8 @@
 #define XENIA_GPU_GL4_SHADER_CACHE_H_
 
 #include <cstdint>
+#include <vector>
+#include <cstring>
 #include <memory>
 #include <unordered_map>
 
@@ -57,4 +59,4 @@ class GL4ShaderCache {
 }  // namespace gpu
 }  // namespace xe
 
-#endif  // XENIA_GPU_GL4_SHADER_CACHE_H_
+#endif  // XENIA_GPU_GL4_SHADER_CACHE_H_