SDL link main window, vsync (#269)

* delete unused library references for xcode

* Link to 52k preset megapack

* SDL: associate GL context with main window, add vsync

* version bump

Author: revmischa

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([projectM], [3.1.1-rc4], [[email protected]], [projectM], [https://github.com/projectM-visualizer/projectm/])
+AC_INIT([projectM], [3.1.1-rc6], [[email protected]], [projectM], [https://github.com/projectM-visualizer/projectm/])
 AM_INIT_AUTOMAKE([-Wall -Werror foreign subdir-objects tar-pax])
 
 m4_ifdef([AM_PROG_AR], [AM_PROG_AR])

src/projectM-sdl/projectM_SDL_main.cpp

@@ -305,6 +305,9 @@ srand((int)(time(NULL)));
 
     SDL_SetWindowTitle(win, "projectM Visualizer");
 
+    SDL_GL_MakeCurrent(win, glCtx);  // associate GL context with main window
+    SDL_GL_SetSwapInterval(-1); // Enable adaptive vsync
+    
     projectMSDL *app;
 
     std::string base_path = DATADIR_PATH;