NSGL: Fix missing check for OpenGL profile

macOS only provides the core profile for OpenGL 3.2 and later.

README.md

@@ -201,6 +201,8 @@ information on what to include when reporting a bug.
  - [POSIX] Bugfix: `CLOCK_MONOTONIC` was not correctly tested for or enabled
  - [WGL] Disabled the DWM swap interval hack for Windows 8 and later (#1072)
  - [NSGL] Removed enforcement of forward-compatible flag for core contexts
+ - [NSGL] Bugfix: A core profile OpenGL context was returned if 3.2+
+   compatibility profile was requested
  - [EGL] Added platform selection via the `EGL_EXT_platform_base` extension
    (#442)
  - [EGL] Added ANGLE backend selection via `EGL_ANGLE_platform_angle` extension

src/nsgl_context.m

@@ -175,6 +175,13 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
         }
     }
 
+    if (ctxconfig->major >= 3 && ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
+    {
+        _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                        "NSGL: The compatibility profile is not available on macOS");
+        return GLFW_FALSE;
+    }
+
     // Context robustness modes (GL_KHR_robustness) are not yet supported by
     // macOS but are not a hard constraint, so ignore and continue