xml2pmx: unbundle from texlive_core

The category is an estimation and not derived from Gentoo, which doesn't have this as a separate package.

dev-tex/xml2pmx/xml2pmx-2021_02_07.recipe

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+SUMMARY="Convert MusicXML to PMX and MusiXTEX"
+DESCRIPTION="xml2pmx translates MusicXML into PMX notation.
+
+MusicXML (http://www.musicxml.com) originally developed by Recordare and now owned by Finale \
+(https://www.finalemusic.com/), is the leading music-data exchange format.
+
+PMX, developed by Don Simons is an easy to use, yet powerful preprocessor for the music \
+typesetting system MusiXTeX.
+
+xml2pmx has been developed by Dieter Gloetzel with the \"Oberon Plugin for Windows Version 2.5\" \
+of ETHZ Zurich on Windows 10 and OLR (Oberon Linux Revival)"
+HOMEPAGE="https://ctan.org/pkg/xml2pmx"
+COPYRIGHT="2011–2021 Bob Tennent
+	2015–2021 Dieter Gloetzel
+	2021 Mike Spivey"
+LICENSE="GNU GPL v3"
+REVISION="1"
+SOURCE_URI="https://mirrors.ctan.org/support/xml2pmx/sources/xml2pmx-${portVersion//_/-}.tar.gz"
+CHECKSUM_SHA256="f8fe78d469b41eec77b35196fa37c511f5dc27f5d54d85183b1ddf43e2b5bac0"
+SOURCE_DIR="xml2pmx-${portVersion//_/-}"
+
+ARCHITECTURES="all"
+
+PROVIDES="
+	xml2pmx = $portVersion
+	cmd:xml2pmx = $portVersion
+	"
+REQUIRES="
+	haiku
+	"
+
+BUILD_REQUIRES="
+	haiku_devel
+	"
+BUILD_PREREQUIRES="
+	cmd:awk
+	cmd:gcc
+	cmd:make
+	"
+
+TEST_REQUIRES="
+	cmd:diff
+	"
+
+defineDebugInfoPackage xml2pmx \
+	$binDir/xml2pmx
+
+BUILD()
+{
+	runConfigure ./configure
+	make $jobArgs
+}
+
+INSTALL()
+{
+	make install
+}
+
+TEST()
+{
+	make check
+}