zlib: override LD{FLAGS,SHAREDLIBC} to make i686-musl build work.

srcpkgs/zlib/template

@@ -1,7 +1,7 @@
 # Template build file for 'zlib'
 pkgname=zlib
 version=1.2.8
-revision=2
+revision=3
 bootstrap=yes
 build_style=configure
 short_desc="A compression/decompression Library"
@@ -10,13 +10,9 @@ license="zlib"
 homepage="http://www.zlib.net"
 distfiles="$homepage/$pkgname-$version.tar.gz"
 checksum=36658cb768a54c1d4dec43c3116c27ed893e88b02ecfcb44f2166f9c0b7f2a0d
-long_desc="
- This is a general purpose data compression library. All the code
- is thread safe. The data format used by the library is described
- by RFCs (Request for Comments) 1950 to 1952."
 
 do_configure() {
-	CFLAGS="$CFLAGS -fPIC" ./configure --prefix=/usr --shared
+	LDFLAGS= LDSHAREDLIBC= ./configure --prefix=/usr --shared
 }
 
 zlib-devel_package() {