gzip: add recipe for version 1.8.

* Add recipe for 1.8 and use a mirror redirector for SOURCE_URI.
* Sort cmd:* in PROVIDES and BUILD_PREREQUIRES and add cmd:less to
  the latter since less(1) is required for "make check".
* Add TEST() with "make check". Test results: PASS = TOTAL = 18.
* Drop removal of lib/charset.alias as it has disappeared.

app-arch/gzip/patches/gzip-1.8.patchset

@@ -0,0 +1,48 @@
+From 39ee8c0d94879bde10822f2b95caedde3d6842fb Mon Sep 17 00:00:00 2001
+From: Timothy Gu <timothygu99@gmail.com>
+Date: Tue, 16 Dec 2014 21:50:24 +0000
+Subject: [PATCH] gzexe: Fallback on file copying for backup
+
+BFS doesn't support hard links.
+
+Signed-off-by: Timothy Gu <timothygu99@gmail.com>
+
+diff --git a/gzexe.in b/gzexe.in
+index e458563..45e1900 100644
+--- a/gzexe.in
++++ b/gzexe.in
+@@ -212,7 +212,7 @@ EOF
+     echo >&2 "$0: $tmp: cannot chmod"
+     continue
+   }
+-  ln -f "$file" "$file~" || {
++  ln -f "$file" "$file~" || cp -f "$file" "${file}~" || {
+     res=$?
+     echo >&2 "$0: cannot backup $i as $i~"
+     continue
+-- 
+1.8.3.4
+
+
+From 67f0045113c5be938d6912969f84ab2b541a9807 Mon Sep 17 00:00:00 2001
+From: fbrosson <fbrosson@localhost>
+Date: Tue, 26 Apr 2016 21:03:14 +0000
+Subject: Do not try to create hard links.
+
+
+diff --git a/Makefile.am b/Makefile.am
+index 738c63c..665974f 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -145,7 +145,7 @@ install-exec-hook remove-installed-links:
+ 	     rm -f "$$dest" && \
+ 	     case $@ in \
+ 	     install-exec-hook) \
+-	       ln "$$source" "$$dest" || $(LN_S) "$$source" "$$dest";; \
++	       $(LN_S) "$$source" "$$dest";; \
+ 	     esac \
+ 	    ) || exit; \
+ 	  done; \
+-- 
+2.7.0
+