md4c: update to 0.5.2.

Changes:

 * Changes mandated by CommonMark specification 0.31:

   - The specification expands set of Unicode characters seen by Markdown
     parser as a punctuation. Namely all Unicode general categories P
     (punctuation) and S (symbols) are now seen as such.

   - The definition of HTML comment has been changed so that `<!-->` and
     `<!--->` are also recognized as HTML comments.

   - HTML tags recognized as HTML block starting condition of type 4 has been
     updated, namely a tag `<source>` has been removed, whereas `<search>`
     added.

   Refer to [CommonMark 0.31.2](https://spec.commonmark.org/0.31.2/) for full
   specification.

Fixes:

 - [#230](mity/md4c#230):
   The fix [#223](mity/md4c#223) in 0.5.1 release
   was incomplete and one corner case remained unfixed. This is now addressed.

 - [#231](mity/md4c#231):
   `md2html --full-html` now emits `<meta  charset="UTF-8">` in the HTML header.

textproc/md4c/Makefile

@@ -1,6 +1,6 @@
-# $NetBSD: Makefile,v 1.2 2024/01/21 20:11:06 wiz Exp $
+# $NetBSD: Makefile,v 1.3 2024/02/10 16:34:13 wiz Exp $
 
-DISTNAME=	md4c-0.5.1
+DISTNAME=	md4c-0.5.2
 CATEGORIES=	textproc converters
 MASTER_SITES=	${MASTER_SITE_GITHUB:=mity/}
 GITHUB_TAG=	release-${PKGVERSION_NOREV}

textproc/md4c/distinfo

@@ -1,5 +1,5 @@
-$NetBSD: distinfo,v 1.2 2024/01/21 20:11:06 wiz Exp $
+$NetBSD: distinfo,v 1.3 2024/02/10 16:34:13 wiz Exp $
 
-BLAKE2s (md4c-0.5.1.tar.gz) = 86d91f6245d8103f5b364fd19e2ef67b95d7a1d37b0c9a83dcbb676cda0206f7
-SHA512 (md4c-0.5.1.tar.gz) = 6cef0b7696ef7477b69948eb2724c153649a02e1fb7eb25c2974ae81df50f34ee59d7e892652b6ca37c0ab118db8603211b0f0f8aa105f72f2fceb51c4fa1e5f
-Size (md4c-0.5.1.tar.gz) = 236442 bytes
+BLAKE2s (md4c-0.5.2.tar.gz) = 4bb0cb910ffcae990fd2cc6625130802baabd1a49b0e7fca8e81491d10026786
+SHA512 (md4c-0.5.2.tar.gz) = 30607ba39d6c59329f5a56a90cd816ff60b82ea752ac2b9df356d756529cfc49170019fae5df32fa94afc0e2a186c66eaf56fa6373d18436c06ace670675ba85
+Size (md4c-0.5.2.tar.gz) = 237973 bytes