[PR PATCH] docbook2mdoc: fix build and extract license file

[mtboehlke <mtboehlke@users.noreply.github.com>]

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There is a new pull request by mtboehlke against master on the void-packages repository

https://github.com/mtboehlke/void-packages docbook2mdoc
https://github.com/void-linux/void-packages/pull/39395

docbook2mdoc: fix build and extract license file
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Use pkg-config to set flags for libbsd, add missing libmd depend, and install a license file

#### Testing the changes
- I tested the changes in this PR: **YES**

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A patch file from https://github.com/void-linux/void-packages/pull/39395.patch is attached

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From 4532202db97281a8b7f5946693334635e2cb7ff2 Mon Sep 17 00:00:00 2001
From: Mat Boehlke <mtboehlke@gmail.com>
Date: Tue, 20 Sep 2022 16:01:49 -0500
Subject: [PATCH] docbook2mdoc: fix build and extract license file

---
 srcpkgs/docbook2mdoc/template | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/srcpkgs/docbook2mdoc/template b/srcpkgs/docbook2mdoc/template
index 24f1bee61836..0c8729a51afe 100644
--- a/srcpkgs/docbook2mdoc/template
+++ b/srcpkgs/docbook2mdoc/template
@@ -1,19 +1,29 @@
 # Template file for 'docbook2mdoc'
 pkgname=docbook2mdoc
 version=1.1.0
-revision=1
+revision=2
 build_style=gnu-makefile
-makedepends="libbsd-devel"
+hostmakedepends="pkg-config"
+makedepends="libbsd-devel libmd-devel"
 short_desc="Converter from DocBook V4.x and v5.x XML into mdoc"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="ISC"
-homepage="http://mdocml.bsd.lv/docbook2mdoc"
-distfiles="http://mdocml.bsd.lv/docbook2mdoc/snapshots/${pkgname}-${version}.tgz"
+homepage="https://mandoc.bsd.lv/docbook2mdoc"
+distfiles="https://mandoc.bsd.lv/docbook2mdoc/snapshots/${pkgname}-${version}.tgz"
 checksum=9fc6411cf041ff10e76f19a50a142075a8df9d343f248e20d8fc98bf8e547c71
 
-LDFLAGS="-lbsd"
+CFLAGS="-D_GNU_SOURCE"
+
 post_extract() {
-	sed -i '/CC.*-o/s/$/ $(LDFLAGS)/' Makefile
-	sed -i 's,/man/man1,/share/man/man1,g' Makefile
-	vsed -e 's:sys/queue.h:bsd/sys/queue.h:' -i node.h
+	# Use pkg-config to set libbsd flags
+	vsed -e '/^CFLAGS/c override CFLAGS += $(shell pkg-config --cflags libbsd-overlay)\
+override LDFLAGS += $(shell pkg-config --libs libbsd-overlay)' \
+		-e '/CC.*-o/s/$/ $(LDFLAGS)/; s,/man/man1,/share/man/man1,g' -i Makefile
+
+	# Create License file
+	sed -E '3,16 !d;s/^ [*] ?//' docbook2mdoc.c > LICENSE
+}
+
+post_install() {
+	vlicense LICENSE
 }