Add packages for unzip and use them.

* remove unzip Jamfile from the build, <build>unzip stays with us.
* clean up image and package definitions.
* added unzip in regular builds.

build/jam/repositories/HaikuPorts/x86

@@ -197,6 +197,7 @@ RemotePackageRepository HaikuPorts
 	tinyxml_devel-2.6.2-1
 	transmission-2.84-3
 	unrar-5.1.5-1
+	unzip-6.0-1
 	vision-0.9.7.r949-1
 	vim-7.4-1
 	wget-1.15-1
@@ -398,6 +399,7 @@ RemotePackageRepository HaikuPorts
 	tinyxml
 	transmission
 	unrar
+	unzip
 	vim
 	vision
 	wget

build/jam/repositories/HaikuPorts/x86_64

@@ -208,6 +208,7 @@ RemotePackageRepository HaikuPorts
 	tinyxml_devel-2.6.2-1
 	transmission-2.84-3
 	unrar-5.1.5-1
+	unzip-6.0-1
 	vim-7.4-2
 	vision-0.9.7.r949-2
 	wget-1.15-1
@@ -338,6 +339,7 @@ RemotePackageRepository HaikuPorts
 	tinyxml
 	transmission
 	unrar
+	unzip
 	vim
 	vision
 	wget

build/jam/repositories/HaikuPorts/x86_gcc2

@@ -373,6 +373,7 @@ RemotePackageRepository HaikuPorts
 	tinyxml_devel-2.6.2-1
 	ubertuber-0.9.10-3
 	unrar-5.1.5-1
+	unzip-6.0-1
 	util_macros-1.19.0-2
 	vim-7.4-3
 	virtualbox_guest_additions-4.3.53_svn-1
@@ -1012,6 +1013,7 @@ RemotePackageRepository HaikuPorts
 	transmission_x86
 	ubertuber
 	unrar
+	unzip
 	util_macros
 	vcmi_x86
 	vim