File fix-sdl.patch of Package gl-117

diff -Nur gl-117-1.3.2-src/configure.in new/configure.in
--- gl-117-1.3.2-src/configure.in	2004-11-13 15:38:38.000000000 +0100
+++ new/configure.in	2021-04-16 05:17:28.185246600 +0200
@@ -56,7 +56,7 @@
 AC_CHECK_LIB(GL,glEnable,LIBS="$LIBS -lGL",AC_MSG_WARN(GL not found - please install GL or MesaGL))
 AC_CHECK_LIB(GLU,gluPerspective,LIBS="$LIBS -lGLU",AC_MSG_WARN(GLU not found - please install GLU or MesaGLU))
 AC_CHECK_LIB(glut,glutMainLoop,LIBS="$LIBS -lglut",AC_MSG_WARN(GLUT not found - please install GLUT or MesaGLUT))
-AC_CHECK_LIB(SDL,SDL_Init,LIBS="$LIBS -lSDL -lSDLmain",AC_MSG_WARN(SDL not found - please install SDL),-lpthread)
+AC_CHECK_LIB(SDL,SDL_Init,LIBS="$LIBS -lSDL",AC_MSG_WARN(SDL not found - please install SDL),-lpthread)
 AC_CHECK_LIB(SDL_mixer,Mix_LoadMUS,LIBS="$LIBS -lSDL_mixer",AC_MSG_WARN(SDL_mixer not found - please install SDL_mixer))
 
 CFLAGS="$CFLAGS"