Fix parallel build in docs/ directory
Every now & then, with parallel builds, we get a failure to validate hvsupport.html.in. I eventually noticed that this is because we get 2 instances of the generator running at once. We already list hvsupport.html.in in BUILT_SOURCES but this was not working. It turns out the flaw is that we were adding deps to the 'all:' target instead of the 'all-am:' target. BUILT_SOURCES is a dep of 'all', so any custom targets written in Makefile.am must use 'all-am:' so that they don't get run until BUILT_SOURCES are completely generated * docs/Makefile.am: s/all/all-am/
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