Fix bug #4511: Added Makefile and rmagick_config.h as dependencies of $(OBJS). Force re-compilation if ./configure is re-run.
Fix bug #4511: Added Makefile and rmagick_config.h as dependencies of $(OBJS).
Force re-compilation if ./configure is re-run.

apecherin/rmagick,rmagick-temp/rmagick,rmagick/rmagick,btakita/rmagick,rmagick-temp/rmagick,tvon/rmagick,modulexcite/rmagick,antonifs/rmagick,btakita/rmagick,mockdeep/rmagick,mockdeep/rmagick,chand3040/Rmagic,rmagick-temp/rmagick,prognostikos/rmagick,jonmartindell/rmagick,tvon/rmagick,rmagick/rmagick,carsonreinke/rmagick,modulexcite/rmagick,antonifs/rmagick,mockdeep/rmagick,prognostikos/rmagick,carsonreinke/rmagick,apecherin/rmagick,chand3040/Rmagic,prognostikos/rmagick,rmagick/rmagick,tvon/rmagick,pecha7x/rmagick,mockdeep/rmagick,pecha7x/rmagick,jonmartindell/rmagick,chand3040/Rmagic,antonifs/rmagick,btakita/rmagick,jonmartindell/rmagick,carsonreinke/rmagick