fix build with --build-suffix

Originally committed as revision 12776 to svn://svn.ffmpeg.org/ffmpeg/trunk

Makefile

@@ -34,7 +34,7 @@ FF_LDFLAGS   := $(FFLDFLAGS)
 FF_EXTRALIBS := $(FFEXTRALIBS)
 
 S := $(BUILD_SHARED:yes=S)
-DEP_LIBS := $(foreach L,$(FFLIBS),lib$(L)/$($(S)LIBPREF)$(L)$($(S)LIBSUF))
+DEP_LIBS := $(foreach NAME,$(FFLIBS),lib$(NAME)/$($(S)LIBNAME))
 
 ALL_TARGETS-$(CONFIG_VHOOK) += videohook
 ALL_TARGETS-$(BUILD_DOC)    += documentation

subdir.mak

@@ -34,7 +34,7 @@ $(SUBDIR)$(SLIBNAME_WITH_MAJOR): $(OBJS)
 
 ifdef SUBDIR
 $(SUBDIR)$(SLIBNAME_WITH_MAJOR): \
-    $(foreach L,$(FFLIBS),lib$(L)/$(SLIBPREF)$(L)$(SLIBSUF))
+    $(foreach NAME,$(FFLIBS),lib$(NAME)/$(SLIBNAME))
 endif
 endif