Make gzip-1.2.4 and tar-1.12 not include timestamps

There is no way for gzip 1.2.4 and tar 1.12 to disable the inclusion of
timestamps into the tarball/gzip, which creates non-reproducible
tarballs and hence packages.

While it is theoretically possible to set the timestamps to unix time 0
using touch, in reality this is not possible because mes libc does not
support utime() which sets the timestamp of a file from userspace. So we
need to ignore it rather than (re)set it.

sysa/gzip-1.2.4/gzip-1.2.4.kaem

@@ -11,11 +11,18 @@ set -ex
 mkdir build
 cd build
 
+catm gzip.c.new ../../files/stat_override.c gzip.c
+cp gzip.c.new gzip.c
+
 # Extract
 ungz ../src/${pkg}.tar.gz
 untar ../src/${pkg}.tar
 cd ${pkg}
 
+# Prepare
+catm gzip.c.new ../../files/stat_override.c gzip.c
+cp gzip.c.new gzip.c
+
 # Compile
 tcc -c -DNO_UTIME gzip.c
 tcc -c bits.c