add romfix.sh

add romfix.sh  leave romfix.exe for legacy build scripts.

romfix64.sh

@@ -0,0 +1,25 @@
+##!/bin/bash
+
+# Check if an argument is provided
+if [ $# -ne 1 ]; then
+    echo "Usage: $0 <path/to/portal.z64>"
+    exit 1
+fi
+
+# Get the provided binary path from the argument
+BINARY_PATH="$1"
+
+# Check if the file exists
+if [ -f "$BINARY_PATH" ]; then
+    # Calculate the size of the binary
+    size=$(stat -c%s "$BINARY_PATH")
+
+    # Pad zeros until the size is a multiple of 512
+    while [ $((size % 512)) -ne 0 ]; do
+        printf '\000' >> "$BINARY_PATH"
+        size=$((size + 1))
+    done
+else
+    echo "File not found: $BINARY_PATH"
+fi
+