Removed implicit glfwMakeCurrentContext.

Implicitly making the context current makes sense in a
single-window API but less sense in a multi-window one.

tests/fsaa.c

@@ -107,6 +107,9 @@ int main(int argc, char** argv)
         exit(EXIT_FAILURE);
     }
 
+    glfwMakeContextCurrent(window);
+    glfwSwapInterval(1);
+
     if (!glfwExtensionSupported("GL_ARB_multisample"))
     {
         glfwTerminate();
@@ -115,8 +118,6 @@ int main(int argc, char** argv)
         exit(EXIT_FAILURE);
     }
 
-    glfwSwapInterval(1);
-
     glGetIntegerv(GL_SAMPLES_ARB, &samples);
     if (samples)
         printf("Context reports FSAA is available with %i samples\n", samples);