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
2022-03-16 11:06:44 +11:00
committed by Friendly Automation
parent 287a1a9126
commit 64f11e0d18
4 changed files with 11861 additions and 9562 deletions

17756
configure vendored

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