graphics/resvg-capi: Add SONAME

graphics/resvg-capi/Makefile

@@ -1,6 +1,7 @@
 PORTNAME=	resvg-c-api
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.28.0
+PORTREVISION=	1
 CATEGORIES=	graphics
 
 MAINTAINER=	yuri@FreeBSD.org

graphics/resvg-capi/files/patch-build.rs

@@ -0,0 +1,8 @@
+-- add SONAME
+
+--- build.rs.orig	1970-01-01 00:00:00 UTC
++++ build.rs
+@@ -0,0 +1,3 @@
++fn main() {
++	println!("cargo:rustc-cdylib-link-arg=-Wl,-soname,libresvg.so");
++}