mono: fix conflict with chicken

Rename csc to mono-csc as it was causing a file conflict with the chicken
compiler.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=509367 and
https://lists.debian.org/debian-mentors/2009/03/msg00690.html.

srcpkgs/mono/template

@@ -1,7 +1,7 @@
 # Template file for 'mono'
 pkgname=mono
 version=5.0.1.1
-revision=2
+revision=3
 wrksrc="mono-${version}"
 lib32disabled=yes
 build_style=gnu-configure
@@ -26,6 +26,8 @@ pre_configure() {
 }
 
 post_install() {
+	# Avoid conflict with chicken's csc compiler
+	mv ${DESTDIR}/usr/bin/csc  ${DESTDIR}/usr/bin/mono-csc
 	vlicense LICENSE
 }