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

Log message:
libxml2: update to 2.9.14, includes security fixes

v2.9.14: May 02 2022:
   - Security:
  [CVE-2022-29824] Integer overflow in xmlBuf and xmlBuffer
  Fix potential double-free in xmlXPtrStringRangeFunction
  Fix memory leak in xmlFindCharEncodingHandler
  Normalize XPath strings in-place
  Prevent integer-overflow in htmlSkipBlankChars() and xmlSkipBlankChars()
    (David Kilzer)
  Fix leak of xmlElementContent (David Kilzer)

   - Bug fixes:
  Fix parsing of subtracted regex character classes
  Fix recursion check in xinclude.c
  Reset last error in xmlCleanupGlobals
  Fix certain combinations of regex range quantifiers
  Fix range quantifier on subregex

   - Improvements:
  Fix recovery from invalid HTML start tags

   - Build system, portability:
  Define LFS macros before including system headers
  Initialize XPath floating-point globals
  configure: check for icu DEFS (James Hilliard)
  configure.ac: produce tar.xz only (GNOME policy) (David Seifert)
  CMakeLists.txt: Fix LIBXML_VERSION_NUMBER
  Fix build with older Python versions
  Fix --without-valid build

Log message:
revbump for textproc/icu update

Log message:
py-libxml2: fix packaging checks when PREFIX is /usr/local

Substituting for /usr/local is a no-op in this case. Addresses
PR pkg/56747 from John Klos.