Add MinGW support to installer script (#1015)

* Initial plan

* Add MinGW support to installer script

Co-authored-by: schollz <[email protected]>

* Fix indentation formatting for consistency

Co-authored-by: schollz <[email protected]>

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: schollz <[email protected]>

Author: Copilot

src/install/default.txt

@@ -580,6 +580,8 @@ main() {
     *"BusyBox"* )
         croc_os="Linux"
         ;;
+    "MINGW"* ) croc_os="Windows";
+                croc_dl_ext="zip";;
     "CYGWIN"* ) croc_os="Windows";
                 croc_dl_ext="zip";
                 print_message "== Cygwin is currently unsupported." "error";