Fix build of automake on bootstrap image:

* prerequire cmd:gcc and cmd:ld
* use bootstrap.sh to bootstrap the build system, otherwise it fails to
  generate aclocal from aclocal.in (which seems to be related to 
  timestamps, as an otherwise identical source folder [from the tree]
  works fine) - hohum ...

sys-devel/automake/automake-1.13.1.recipe

@@ -34,6 +34,8 @@ BUILD_REQUIRES="
 BUILD_PREREQUIRES="
 	haiku_devel >= $haikuVersion
 	cmd:autoconf >= 2.60
+	cmd:gcc
+	cmd:ld
 	cmd:make
 	cmd:makeinfo
 	cmd:perl >= 5.8
@@ -44,6 +46,7 @@ SOURCE_DIR="$portVersionedName"
 
 BUILD()
 {
+	./bootstrap.sh
 	PERL="/bin/env perl" runConfigure ./configure
 	make $jobArgs
 }