a150b26ee8
Split the process to fetch GNU tools (until now embedded within tools/Makefile.gnuhost) into a new Makefile.fetchgnu, MINIX-specific hence relocated, which is to be also used to fetch sources even when not building the tools. Use it for binutils too. Improve documentation. Also do not run configure on each run when MKUPDATE=yes The .WAIT serialization instruction between fetching and other configure sources was raising a new run of configure at each compilation. Avoid it by using two rules. Change-Id: Ie24950ccbb5c5067f3c1ea57b7bd8294e4c9445e