mail-filter/spamprobe: update EAPI 6 -> 7, fix gcc 11 build

Closes: https://bugs.gentoo.org/787311
Signed-off-by: Sam James <sam@gentoo.org>

mail-filter/spamprobe/files/spamprobe-1.4d-gcc11-const-comp.patch

@@ -0,0 +1,13 @@
+diff --git a/src/includes/LRUCache.h b/src/includes/LRUCache.h
+index cf7df30..50467d5 100644
+--- a/src/includes/LRUCache.h
++++ b/src/includes/LRUCache.h
+@@ -60,7 +60,7 @@ public:
+   {
+   public:
+     bool operator()(const NodeType *a,
+-                    const NodeType *b)
++                    const NodeType *b) const
+     {
+       return a->key < b->key;
+     }

mail-filter/spamprobe/spamprobe-1.4d-r2.ebuild

@@ -1,7 +1,7 @@
 # Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI=6
+EAPI=7
 
 DESCRIPTION="Fast, intelligent, automatic spam detector using Bayesian analysis"
 HOMEPAGE="http://spamprobe.sourceforge.net/"
@@ -26,6 +26,7 @@ PATCHES=(
 	"${FILESDIR}"/${P}+db-5.0.patch
 	"${FILESDIR}"/${P}-gcc47.patch
 	"${FILESDIR}"/${P}-giflib5.patch
+	"${FILESDIR}"/${P}-gcc11-const-comp.patch
 )
 
 src_configure() {
@@ -37,6 +38,7 @@ src_configure() {
 
 src_install() {
 	default
+
 	insinto /usr/share/${PN}/contrib
 	doins contrib/*
 }