[Asterisk-code-review] configure.ac: Use pkg-config to detect libxml2 (asterisk[19])

[Friendly Automation]

Friendly Automation has submitted this change. ( https://gerrit.asterisk.org/c/asterisk/+/18242 )

Change subject: configure.ac: Use pkg-config to detect libxml2
......................................................................

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
---
M configure
M configure.ac
M menuselect/configure
M menuselect/configure.ac
4 files changed, 11,861 insertions(+), 9,562 deletions(-)

Approvals:
  Joshua Colp: Looks good to me, but someone else must approve
  Kevin Harwell: Looks good to me, approved
  Friendly Automation: Approved for Submit




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Gerrit-Project: asterisk
Gerrit-Branch: 19
Gerrit-Change-Id: I3c90dfe0b0590486cbb8e6d426a7c5c4199410c0
Gerrit-Change-Number: 18242
Gerrit-PatchSet: 2
Gerrit-Owner: Hugh McMaster <hugh.mcmaster at outlook.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Joshua Colp <jcolp at sangoma.com>
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
Gerrit-MessageType: merged
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