Add mailcap to dependencies

Without `/etc/mime.types` (from mailcap) or alternatively
`/usr/share/mime/globs2` (created by the pacman hook of
shared-mime-info), Caddy will not set a `Content-Type` header for the
files it serves.

See https://wiki.archlinux.org/title/Caddy#Missing_Content-Type

.SRCINFO

@@ -8,6 +8,7 @@ pkgbase = caddy
 	makedepends = git
 	makedepends = go
 	depends = glibc
+	depends = mailcap
 	backup = etc/caddy/Caddyfile
 	source = git+https://github.com/caddyserver/caddy.git#tag=v2.10.0?signed
 	source = caddy-dist::git+https://github.com/caddyserver/dist.git#tag=v2.10.0

PKGBUILD

@@ -15,6 +15,7 @@ arch=(x86_64)
 license=(Apache-2.0)
 depends=(
   glibc
+  mailcap
 )
 makedepends=(
   git