zlib: remove LDFLAGS workaround.

Added in 4d39b70166 without explanation as
to why.

We also revbump to rebuild the binary. On x86_64-musl, old libz.so,
built with gcc 7, is using a 2132KB RE mmap when dynamically linked,
probably because of a 0x200000 alignment required for the RE section.
After rebuilding, 96KB are used, with the actual RE mmap reduced to 56K.
The new alignment is 0x1000.

srcpkgs/zlib/template

@@ -1,9 +1,10 @@
 # Template file for 'zlib'
 pkgname=zlib
 version=1.2.11
-revision=3
+revision=4
 bootstrap=yes
 build_style=configure
+configure_args="--prefix=/usr --shared"
 short_desc="Compression/decompression Library"
 maintainer="Orphaned <orphan@voidlinux.org>"
 license="Zlib"
@@ -11,10 +12,6 @@ homepage="http://www.zlib.net"
 distfiles="$homepage/$pkgname-$version.tar.gz"
 checksum=c3e5e9fdd5004dcb542feda5ee4f0ff0744628baf8ed2dd5d66f8ca1197cb1a1
 
-do_configure() {
-	LDFLAGS= LDSHAREDLIBC= ./configure --prefix=/usr --shared
-}
-
 zlib-devel_package() {
 	depends="zlib>=${version}_${revision}"
 	short_desc+=" - development files"