Enable sdl_gl for SDL2 windows builds
Merge pull request #894 from heuripedes/master

Enable sdl_gl for SDL2 windows builds
(PSP1) Fix build
(settings) Set autoconfig_dir if g_defaults.autoconfig_dir is set
(Haiku) Fix undefined min_filter_to_mag reference
(Haiku) Fix socket,pthread_create and freetype2 checks in configure
(Haiku) Link against -lroot and -lnetwork
(non-Haiku) Fix undefined reference to min_filter_to_mag
(Haiku) Fix typo in config.libs.sh
(Haiku) Check for getaddrinfo in $SOCKETLIB
(Haiku) Use -lroot instead of -lc
(Haiku) Fix fill_pathname_application_path()
(Haiku) Add fix for video driver segfaults
(Haiku) Raise minimum SDL2 version in sdl2_gfx_free()