fix(zlib): keep bootstrap static and build shared zlib in steps-guix

steps-guix/manifest

@@ -28,6 +28,7 @@ build: gnutls-3.8.12
 build: guile-gnutls-v5.0.1
 build: unzip-6.0
 build: sqlite-3510200
+build: zlib-1.3.1
 build: guile-sqlite3-0.1.3
 build: guile-zlib-0.2.2
 build: guile-lzlib-0.0.2

steps-guix/zlib-1.3.1/pass1.sh

@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default
+
+    rm zlib.3.pdf \
+        doc/crc-doc.1.0.pdf \
+        contrib/puff/zeros.raw \
+        contrib/blast/test.pk \
+        contrib/dotzlib/DotZLib.chm
+
+    rm crc32.h
+    gcc -DMAKECRCH crc32.c -o gen_crc32h
+    ./gen_crc32h
+
+    echo "void makefixed(void); int main() { makefixed(); }" > makefixed_main.c
+    gcc -DMAKEFIXED inflate.c crc32.c zutil.c inftrees.c \
+        adler32.c inffast.c makefixed_main.c -o gen_inffixedh
+    ./gen_inffixedh > inffixed.h
+
+    echo "void makefixed9(void); int main() { makefixed9(); }" > makefixed9_main.c
+    gcc -DMAKEFIXED -I. contrib/infback9/infback9.c zutil.c \
+        contrib/infback9/inftree9.c makefixed9_main.c -o gen_inffix9h
+    ./gen_inffix9h > contrib/infback9/inffix9.h
+}
+
+src_configure() {
+    ./configure --prefix="${PREFIX}" --libdir="${LIBDIR}" --shared
+}

steps-guix/zlib-1.3.1/sources

@@ -0,0 +1 @@
+f https://zlib.net/fossils/zlib-1.3.1.tar.gz 9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23