main/diffutils: fix test suite

main/diffutils/APKBUILD

@@ -1,14 +1,15 @@
 # Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
 pkgname=diffutils
 pkgver=3.6
-pkgrel=0
+pkgrel=1
 pkgdesc="Show differences among files"
 subpackages="$pkgname-doc"
 url="https://www.gnu.org/software/diffutils/"
 arch="all"
 license="GPL-3.0-or-later"
-options="!check"
-source="http://ftp.gnu.org/pub/gnu/$pkgname/$pkgname-$pkgver.tar.xz"
+source="http://ftp.gnu.org/pub/gnu/$pkgname/$pkgname-$pkgver.tar.xz
+	disable-mbrtowc-test.patch
+	"
 builddir=$srcdir/$pkgname-$pkgver
 
 prepare() {
@@ -45,4 +46,5 @@ package() {
 	rmdir -p "$pkgdir"/usr/lib 2>/dev/null || true
 }
 
-sha512sums="3c159ff1cb7c901b0a57518483566b5740ca3c45aeb8d3004089f052975481db52994cc18592c502c68b0d2a1e22f1f7830f0d8dd9a9ed86de96e28cce9f70c1  diffutils-3.6.tar.xz"
+sha512sums="3c159ff1cb7c901b0a57518483566b5740ca3c45aeb8d3004089f052975481db52994cc18592c502c68b0d2a1e22f1f7830f0d8dd9a9ed86de96e28cce9f70c1  diffutils-3.6.tar.xz
+2602dabf0ac52a273b84160032416613da7ad111541fe25466cf9d4ce1eb2630f0ba0cb0b3013967965d8359a11a5f390f0486b4526b35516d9de1c8975f720d  disable-mbrtowc-test.patch"

main/diffutils/disable-mbrtowc-test.patch

@@ -0,0 +1,10 @@
+--- diffutils-3.6/gnulib-tests/test-mbrtowc5.sh.old	2016-12-31 13:54:43.000000000 +0000
++++ diffutils-3.6/gnulib-tests/test-mbrtowc5.sh	2017-07-30 17:29:50.879924130 +0000
+@@ -1,6 +1,2 @@
+ #!/bin/sh
+-# Test whether the POSIX locale has encoding errors.
+-LC_ALL=C \
+-./test-mbrtowc${EXEEXT} 5 || exit
+-LC_ALL=POSIX \
+-./test-mbrtowc${EXEEXT} 5
++exit 77