main/gawk: upgrade to 4.2.0; modernize

main/gawk/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 # Contributor: Michael Mason <ms13sp@gmail.com>
 # Contributor: Bartłomiej Piotrowski <nospam@bpiotrowski.pl>
+# Contributor: TBK <alpine@jjtc.eu>
 pkgname=gawk
-pkgver=4.1.4
+pkgver=4.2.0
 pkgrel=0
 pkgdesc="GNU awk pattern-matching language"
 url="http://www.gnu.org/software/gawk/gawk.html"
@@ -10,14 +11,14 @@ arch="all"
 license="GPL"
 subpackages="$pkgname-doc"
 source="http://ftp.gnu.org/gnu/$pkgname/$pkgname-$pkgver.tar.xz"
+builddir="$srcdir/$pkgname-$pkgver"
 
-_builddir="$srcdir/$pkgname-$pkgver"
 prepare() {
-	cd "$_builddir"
+	cd "$builddir"
 }
 
 build() {
-	cd "$_builddir"
+	cd "$builddir"
 	./configure \
 		--build=$CBUILD \
 		--host=$CHOST \
@@ -25,16 +26,13 @@ build() {
 		--sysconfdir=/etc \
 		--mandir=/usr/share/man \
 		--infodir=/usr/share/info \
-		--disable-nls \
-		|| return 1
-	make || return 1
+		--disable-nls
+	make
 }
 
 package() {
 	cd "$srcdir/$pkgname-$pkgver"
-	make DESTDIR="$pkgdir" install || return 1
+	make DESTDIR="$pkgdir" install
 }
 
-md5sums="4e7dbc81163e60fd4f0b52496e7542c9  gawk-4.1.4.tar.xz"
-sha256sums="53e184e2d0f90def9207860531802456322be091c7b48f23fdc79cda65adc266  gawk-4.1.4.tar.xz"
-sha512sums="6a0e9cf086544212f54b54261dcd517b611aaf495ef99c4b7740d07e363bb00c5632f3d7fd5e12a954d5aa9793764162a57453e0e18884b29c6c54b5f444c097  gawk-4.1.4.tar.xz"
+sha512sums="3076b2f42e43fff0ce63dcaa3fb749ce421473d0abc3e1e2d9dd375207d3e35c98d5bf91c3179f49156e8a4977424c16bb2d3d662846ad487153729dd4cfeb4c  gawk-4.2.0.tar.xz"