mail/rubygem-mail: Fix dependency with upcoming Ruby 3.1

In Ruby 3.1 net/smtp is distributed as bundled gem. On the other hand,
our ruby ports (lang/rubyXY) don't include bandled gems in thier
packages and it also applies to upcoming lang/ruby31. That means
net/smtp isn't include in lang/ruby31 package. So add
mail/rubygem-net-smtp to RUN_DEPENDS so this port works fine with Ruby
3.1.

Note that this depends on bug #258108.

mail/rubygem-mail/Makefile

@@ -1,7 +1,8 @@
 # Created by: Eric Freeman <[email protected]>
 
 PORTNAME=	mail
-PORTVERSION=	2.7.1
+DISTVERSION=	2.7.1
+PORTREVISION=	1
 PORTEPOCH=	2
 CATEGORIES=	mail rubygems
 MASTER_SITES=	RG
@@ -12,7 +13,8 @@ COMMENT=	Ruby email handler
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/MIT-LICENSE
 
-RUN_DEPENDS=	rubygem-mini_mime>=0.1.1:mail/rubygem-mini_mime
+RUN_DEPENDS=	rubygem-mini_mime>=0.1.1:mail/rubygem-mini_mime \
+		rubygem-net-smtp>0:mail/rubygem-net-smtp
 
 USES=		cpe gem
 CPE_VENDOR=	${PORTNAME}_project

mail/rubygem-mail/files/patch-mail.gemspec

@@ -0,0 +1,18 @@
+--- mail.gemspec.orig	2021-11-10 18:38:59 UTC
++++ mail.gemspec
+@@ -24,6 +24,7 @@ Gem::Specification.new do |s|
+   end
+
+   if s.respond_to? :add_runtime_dependency then
++    s.add_runtime_dependency(%q<net-smtp>.freeze, [">= 0"])
+     s.add_runtime_dependency(%q<mini_mime>.freeze, [">= 0.1.1"])
+     s.add_development_dependency(%q<bundler>.freeze, [">= 1.0.3"])
+     s.add_development_dependency(%q<rake>.freeze, ["> 0.8.7"])
+@@ -31,6 +32,7 @@ Gem::Specification.new do |s|
+     s.add_development_dependency(%q<rdoc>.freeze, [">= 0"])
+     s.add_development_dependency(%q<rufo>.freeze, [">= 0"])
+   else
++    s.add_dependency(%q<net-smtp>.freeze, [">= 0"])
+     s.add_dependency(%q<mini_mime>.freeze, [">= 0.1.1"])
+     s.add_dependency(%q<bundler>.freeze, [">= 1.0.3"])
+     s.add_dependency(%q<rake>.freeze, ["> 0.8.7"])