Fixed bug 2691 - Disabling shared library prevent cmake configuration

hotgloupi

Configuring using "cmake -DSDL_STATIC=1 -DSDL_SHARED=0" generate and error in CMakeLists.txt at line 1334:

CMake Error at CMakeLists.txt:1334 (install):
  install TARGETS given target "SDL2" which does not exist in this directory.

This install rule shouldn't be present when the DLL has been disabled

CMakeLists.txt

@@ -1331,7 +1331,9 @@ if(NOT WINDOWS OR CYGWIN)
   # TODO: what about the .spec file? Is it only needed for RPM creation?
   install(FILES "${SDL2_SOURCE_DIR}/sdl2.m4" DESTINATION "share/aclocal")
 else()
-  install(TARGETS SDL2 RUNTIME DESTINATION bin)
+  if(SDL_SHARED)
+    install(TARGETS SDL2 RUNTIME DESTINATION bin)
+  endif()
 endif()
 
 ##### Uninstall target #####