cmark: fix soname to use just the major number

srcpkgs/cmark/template

@@ -1,7 +1,7 @@
 # Template file for 'cmark'
 pkgname=cmark
 version=0.28.3
-revision=1
+revision=2
 build_style=cmake
 short_desc="CommonMark parsing and rendering library and program in C"
 maintainer="pancake <pancake@nopcode.org>"
@@ -10,6 +10,12 @@ homepage="https://github.com/jgm/cmark"
 distfiles="https://github.com/jgm/cmark/archive/${version}.tar.gz"
 checksum=acc98685d3c1b515ff787ac7c994188dadaf28a2d700c10c1221da4199bae1fc
 
+pre_configure() {
+	# Fix the SONAME version to use just the major number
+	sed -i src/CMakeLists.txt \
+		-e 's;\(SOVERSION ${PROJECT_VERSION_MAJOR}\).*;\1;'
+}
+
 post_install() {
 	vlicense COPYING
 }