Commit 8a6c8d4 for zlib

commit 8a6c8d4ece6fe8eaa733f7ec5149cbc54083e757
Author: Chi-Iroh <69324626+Chi-Iroh@users.noreply.github.com>
Date:   Tue Oct 21 15:06:22 2025 +0200

    Rename OS/400 free-form header.

diff --git a/os400/make.sh b/os400/make.sh
index c24afe9..e9643f5 100644
--- a/os400/make.sh
+++ b/os400/make.sh
@@ -251,7 +251,7 @@ then    CMD="CPY OBJ('${HFILE}') TOOBJ('${DEST}')"
         system "CHGPFM FILE(${TARGETLIB}/H) MBR(${MBR}) SRCTYPE(RPGLE)"
 fi

-HFILE="${SCRIPTDIR}/zlibfree"
+HFILE="${SCRIPTDIR}/zlibfree.rpgle"
 MBR="ZLIBFREE"
 DEST="${SRCPF}/${MBR}.MBR"

diff --git a/os400/zlibfree.inc b/os400/zlibfree.rpgle
similarity index 100%
rename from os400/zlibfree.inc
rename to os400/zlibfree.rpgle