Remove unused includes from Shader.cpp

Reviewed By: corporateshark, xiendong

Differential Revision: D93897445

fbshipit-source-id: 19286d0c19f20f41d0269586e134a6f328e6174a

Author: Ramesh Viswanathan

src/igl/Shader.cpp

@@ -8,8 +8,6 @@
 #include <igl/Shader.h>
 
 #include <cstring>
-#include <type_traits>
-#include <igl/Common.h>
 
 namespace {