testing/nbtscan: enable -dbg subpackage

and remove _pkgver variable

testing/nbtscan/APKBUILD

 # Maintainer: François Chavant <alpine@mail.chavant.info>
 pkgname=nbtscan
 pkgver=1.5.1
-_pkgver="${pkgver}a"
-pkgrel=0
+pkgrel=1
 pkgdesc="NETBIOS nameserver scanner"
 url="http://www.inetcat.net/software/nbtscan.html"
 arch="all"
@@ -12,9 +11,10 @@ makedepends=""
 install=""
 #source="http://www.inetcat.org/software/${pkgname}_$pkgver.tar.gz"
 source="http://www.sourcefiles.org/Networking/Tools/Miscellanenous/$pkgname-$pkgver.tar.gz"
+subpackages="$pkgname-dbg"
 options="!check"
 
-builddir="$srcdir/$pkgname-$_pkgver"
+builddir="$srcdir/$pkgname-${pkgver}a"
 
 build() {
 	cd "$builddir"