fixup to 860539f: make install.sh compatible with Cirrus

Author: asomers

ci/install.sh

@@ -5,7 +5,7 @@ main() {
     local target=
     if [ `uname` = "Linux" ]; then
         target=x86_64-unknown-linux-musl
-    else if [ `uname` = "FreeBSD" ]; then
+    elif [ `uname` = "FreeBSD" ]; then
         target=x86_64-unknown-freebsd
     else
         target=x86_64-apple-darwin