p11-kit: fix trust paths.

Some flatpaks broke with the move to meson [1], which doesn't set
trust_paths automatically (the autoconf based build system did, by
checking what files were available on the system - it picked
/etc/ssl/certs/ca-certificates.crt for our build).

p11-kit on the host system matters for flatpaks, as seen in [2].

Thanks to steinex for coming up with the solution. [3] was a fix for the
same issue, but with autoconf.

[1] 7377f185fc
[2] https://github.com/p11-glue/p11-kit/issues/275
[3] 27d5c551b4

srcpkgs/p11-kit/template

@@ -1,10 +1,11 @@
 # Template file for 'p11-kit'
 pkgname=p11-kit
 version=0.23.22
-revision=2
+revision=3
 build_style=meson
 configure_args="-Dlibffi=enabled -Dsystemd=disabled -Dbash_completion=disabled
- -Dgtk_doc=true -Dman=true -Dnls=true -Dtrust_module=enabled"
+ -Dgtk_doc=true -Dman=true -Dnls=true -Dtrust_module=enabled
+ -Dtrust_paths=/etc/ssl/certs/ca-certificates.crt"
 hostmakedepends="pkg-config gettext gtk-doc libxslt libtasn1-tools"
 # glib-devel for gtk-doc
 makedepends="libtasn1-devel libffi-devel glib-devel"