Add GLFW_CONTEXT_NO_ERROR window hint

This adds support for the GL_KHR_no_error extension.

src/egl_context.h

@@ -88,6 +88,7 @@
 #define EGL_CONTEXT_MINOR_VERSION_KHR 0x30fb
 #define EGL_CONTEXT_OPENGL_PROFILE_MASK_KHR 0x30FD
 #define EGL_CONTEXT_FLAGS_KHR 0x30fc
+#define EGL_CONTEXT_OPENGL_NO_ERROR_KHR 0x31b3
 #define EGL_NATIVE_VISUAL_ID 0x302e
 #define EGL_NO_SURFACE ((EGLSurface) 0)
 #define EGL_NO_DISPLAY ((EGLDisplay) 0)
@@ -160,6 +161,7 @@ typedef struct _GLFWlibraryEGL
     EGLint          major, minor;
 
     GLFWbool        KHR_create_context;
+    GLFWbool        KHR_create_context_no_error;
 
     void*           handle;