[Devel] improved build support for FT

[Werner LEMBERG]

I've fixed the makefiles to support external builds better.  Using
the FreeType's top-level configure script, you can now say

  ~/foo: /usr/local/src/freetype2/configure
  ~/foo: make
  ~/foo: make install

Using GNU make directly without configure, you must e.g. say

  ~/foo: OBJ_DIR=~/foo TOP=/usr/local/src/freetype2 \
         make -f $TOP/Makefile setup ansi
  ~/foo: OBJ_DIR=~/foo TOP=/usr/local/src/freetype2 \
         make -f $TOP/Makefile

Please test and enjoy!


   Werner