lib/Makefile gets variables suitable for src/Makefile

[Eli Zaretskii]

I noticed that after running the configure script on a GNU/Linux
system, lib/Makefile defines a large number of variables that are
really specific to src/Makefile.  Here's a small example:

  FONTCONFIG_CFLAGS =
  FONTCONFIG_LIBS = -lfontconfig
  FONT_OBJ = xfont.o ftfont.o xftfont.o ftxfont.o
  FREETYPE_CFLAGS =
  FREETYPE_LIBS =
  GCONF_CFLAGS =
  GCONF_LIBS =

(The full list is very large.)

Is this intended and/or expected?  I know that unused variables don't
do any harm (except, perhaps, bloating Make's memory footprint), but
still, it looks rather unclean to me.