Commit Briefs
install(1): mention libfontconfig1-dev for Debian
Also update install.txt, which mistakenly contained intro(1). Pointed out by Nicholas Schwartz.
install.txt: regenerate (9 man 1 intro >install.txt)
Change-Id: I80331732ce955d5b025a3552d15c6d7494752bf6 Reviewed-on: https://plan9port-review.googlesource.com/1093 Reviewed-by: Russ Cox <rsc@swtch.com>