Generalize example target rule in common.mak so that it sets a -example$(EXESUF)

suffix for all example files instead of doing this in individual Makefiles.

Originally committed as revision 29100 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale

libswscale/Makefile

@@ -18,7 +18,7 @@ MMX-OBJS-$(CONFIG_GPL)     +=  x86/yuv2rgb_mmx.o        \
 
 OBJS-$(HAVE_MMX)           +=  $(MMX-OBJS-yes)
 
-EXAMPLES  = swscale-example
+EXAMPLES  = swscale
 TESTPROGS = colorspace
 
 DIRS = bfin mlib ppc sparc x86