cross-vpkg-dummy: add libgfortran.so.3

Forgot to add the libgfortran.so.3 to the shlib_provides. I need a break.

srcpkgs/cross-vpkg-dummy/template

@@ -1,7 +1,7 @@
 # Template file for 'cross-vpkg-dummy'
 pkgname=cross-vpkg-dummy
 version=0.23
-revision=1
+revision=2
 build_style=meta
 short_desc="Dummy meta-pkg for cross building packages with xbps-src"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
@@ -57,6 +57,7 @@ shlib_provides="
 	libutil.so.1
 	libgcc_s.so.1
 	libstdc++.so.6
+	libgfortran.so.3
 	libgomp.so.1
 	ld-linux.so.2
 	ld-linux.so.3