buildgcc: refactor package unpacking, patching and building

- keep a list of packages to build in $PACKAGES and only download,
  patch and build a package if it is in that list (instead of having
  exceptions for GDB, EXPAT and PYTHON)
- unify interface for download() and unpack_and_patch()
- consolidate some randomly spread code like creating / removing
  build directories and calls to searchtool()

Change-Id: I2070e3b2fbb84eb18e9220658fb2d5518b8179ee
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10434
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

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