configure.ac: Use pkg-config to detect libxml2

Use pkg-config to detect libxml2, falling back to xml2-config if the
former is not available.

This patch ensures Asterisk continues to build on systems without
xml2-config installed.

The patch also updates the associated 'configure' files.

ASTERISK-29970 #close

Change-Id: I3c90dfe0b0590486cbb8e6d426a7c5c4199410c0
This commit is contained in:
Hugh McMaster
2022-03-15 22:56:42 +11:00
committed by Kevin Harwell
parent f50e793665
commit b678624f04
4 changed files with 12056 additions and 9747 deletions

18136
configure vendored

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