main/bc: Added readline support

The makedepens `readline-dev` suggests that readline support was intented.
However, option `--with-readline` needs also be passed to compile bc with
readline support. In addtion, I added readline as dependency.

main/bc/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=bc
 pkgver=1.06.95
-pkgrel=3
+pkgrel=4
 pkgdesc="An arbitrary precision numeric processing language (calculator)"
 url="http://www.gnu.org/software/bc/bc.html"
 arch="all"
@@ -24,7 +24,8 @@ build() {
 		--prefix=/usr \
 		--sysconfdir=/etc \
 		--mandir=/usr/share/man \
-		--infodir=/usr/share/info
+		--infodir=/usr/share/info \
+		--with-readline
 	make
 }