Add Joliet file system to the ISO

Joliet ensures correct file names capitalization on operating systems that support Joliet but not support Rock Ridge.

Implements #45 (closed).

archiso/mkarchiso

@@ -309,6 +309,7 @@ command_iso () {
         xorriso -as mkisofs -quiet \
             -iso-level 3 \
             -full-iso9660-filenames \
+            -joliet -joliet-long \
             -rational-rock \
             -volid "${iso_label}" \
             -appid "${iso_application}" \
@@ -325,6 +326,7 @@ command_iso () {
         xorriso -as mkisofs \
             -iso-level 3 \
             -full-iso9660-filenames \
+            -joliet -joliet-long \
             -rational-rock \
             -volid "${iso_label}" \
             -appid "${iso_application}" \