glibc: build with --enable-obsolete-nsl

needed to make sure libnsl's headers are installed once again, for the full
details, please refer to #7846 .

Closes: #7928 [via git-merge-pr]

srcpkgs/glibc/template

@@ -1,7 +1,7 @@
 # Template file for 'glibc'
 pkgname=glibc
 version=2.26
-revision=2
+revision=3
 bootstrap=yes
 short_desc="The GNU C library"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
@@ -105,7 +105,7 @@ do_configure() {
 		--disable-profile --enable-kernel=2.6.32 \
 		--enable-stack-guard-randomization \
 		--without-selinux --without-cvs --without-gd \
-		--disable-lock-elision \
+		--disable-lock-elision --enable-obsolete-nsl \
 		--enable-stack-protector=strong \
 		libc_cv_rootsbindir=/usr/bin \
 		libc_cv_rtlddir=${_libdir} libc_cv_slibdir=${_libdir}