Log message:
py-libxml2: require fixed libxml2 version

Log message:
textproc/libxml2, textproc/py-libxml2: fix dependencies and PKGREVISION

Make sure the fixed build of libxml2 with the deprecated symbols is pulled
in.

Log message:
*: recursive bump for icu 74.1

Log message:
py-libxml2: Add explanation of incorrect header file processing

It remains to turn the explanation of what is going wrong into a fix,
awaiting comments and perhaps the branch.

The esssence of the problem is that at least on older macOS, there is
a native libxml2 with legacy enabled, not intended to be used by the
package, and a native iconv, which is intended to be used, and the
ordering of -I results in the native libxml2 headers being used.

Log message:
Mass-change BUILD_DEPENDS to TOOL_DEPENDS outside mk/.

Almost all uses, if not all of them, are wrong, according to the
semantics of BUILD_DEPENDS (packages built for target available for
use _by_ tools at build-time) and TOOL_DEPEPNDS (packages built for
host available for use _as_ tools at build-time).

No change to BUILD_DEPENDS as used correctly inside buildlink3.

As proposed on tech-pkg:
https://mail-index.netbsd.org/tech-pkg/2023/06/03/msg027632.html

Log message:
revbump after textproc/icu update

Log message:
libxml2 & py-libxml2: update to 2.10.4

v2.10.4: Apr 11 2023

### Security

- [CVE-2023-29469] Hashing of empty dict strings isn't deterministic
- [CVE-2023-28484] Fix null deref in xmlSchemaFixupComplexType
- schemas: Fix null-pointer-deref in xmlSchemaCheckCOSSTDerivedOK

### Regressions

- SAX2: Ignore namespaces in HTML documents
- io: Fix "buffer full" error with certain buffer sizes

Log message:
py-libxml2: Bump PKGREVISION for libxml2 fix.

Set straight to 2 because this was previously erroneously coming from
libxml2's Makefile.common which had it set to 1.

Log message:
py-libxml2: update to 2.10.3.

Change: see libxml2.

Log message:
massive revision bump after textproc/icu update