Add getopt implementation to abuild

Similar to buildgcc, abuild requires getopt(1). Provide an
implementation for platforms without it (Win32)

Change-Id: I2ae4d84e06dd34135c97b18819da2b49a89706ce
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/862
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

util/abuild/abuild

@@ -563,6 +563,10 @@ test -f util/sconfig/sconfig.l && ROOT=$( pwd )
 test -f ../util/sconfig/sconfig.l && ROOT=$( cd ..; pwd )
 test "$ROOT" = "" && ROOT=$( cd ../..; pwd )
 
+# Look if we have getopt. If not, build it.
+export PATH=$PATH:util/abuild
+getopt - > /dev/null 2>/dev/null || gcc -o util/abuild/getopt util/abuild/getopt.c
+
 # parse parameters.. try to find out whether we're running GNU getopt
 getoptbrand="`getopt -V`"
 if [ "${getoptbrand:0:6}" == "getopt" ]; then