fix: typo in install script preventing MSYS Windows (#341)

Issue #, if available:
Found while integrating fd0402 in finch

*Description of changes:*
This change fixes a typo in install.sh preventing MSYS Windows

*Testing done:*


- [x] I've reviewed the guidance in CONTRIBUTING.md


#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Austin Vazquez <[email protected]>

Author: austinvazquez

deps/install.sh

@@ -76,7 +76,7 @@ os="$(uname -s)"
 case "${os}" in
   "Darwin")
     ;;
-  CYGWIN*|MINGW32*|MINGW*|MYSYS*)
+  CYGWIN*|MINGW32*|MINGW*|MSYS*)
     windows=true
     ;;
   *)