New comment by sgn on void-packages repository

https://github.com/void-linux/void-packages/pull/21131#issuecomment-616556679

Comment:
Here is my final diff on top of your change,
this will enable cross-build for mu and fix the check,
I think you're the maintainer of this package, if it's ok to you,
I'll push this version out.

```diff
diff --git a/srcpkgs/mu/template b/srcpkgs/mu/template
index 51f733e03c..bbe37e1138 100644
--- a/srcpkgs/mu/template
+++ b/srcpkgs/mu/template
@@ -3,8 +3,9 @@ pkgname=mu
 version=1.4.1
 revision=1
 build_style=gnu-configure
-hostmakedepends="automake libtool pkg-config emacs texinfo"
+hostmakedepends="automake libtool pkg-config texinfo glib-devel"
 makedepends="xapian-core-devel gmime3-devel libuuid-devel"
+checkdepends="tzdata"
 short_desc="Emacs-based tool for dealing with e-mail stored in the Maildir-format"
 maintainer="Benjamin Slade <slade@jnanam.net>"
 license="GPL-3.0-or-later"
@@ -12,12 +13,23 @@ homepage="https://www.djcbsoftware.nl/code/mu/"
 distfiles="https://github.com/djcb/mu/archive/${version}.tar.gz"
 checksum=66ae911abb3d7269514fada08e7a13ad61a205e10209055c41df2f9d17568274
 
+if [ ! "$CROSS_BUILD" ]; then
+	subpackages="mu4e"
+	hostmakedepends+=" emacs"
+else
+	# force subpackages to non-empty value,
+	# else xbps-src will generate it.
+	subpackages=" "
+	configure_args+=" --disable-mu4e"
+fi
+
 pre_configure() {
 	sed -i 's,-I${prefix}/include,,' contrib/Makefile.am
 	autoreconf -fi
 }
 
 mu4e_package() {
+	archs=noarch
 	short_desc+=" - Emacs frontend"
 	depends="${sourcepkg}>=${version}_${revision} emacs"
 	pkg_install() {
```