Update build-osx.md

Author: regergregregerrge

doc/build-osx.md

@@ -87,7 +87,7 @@ Rerunning "openssl version" should now return the correct version.
 
 1. Clone the github tree to get the source code and go into the directory.
 
-        git clone git@github.com:bitcoin/bitcoin.git bitcoin
+        git clone https://github.com/bitcoin/bitcoin.git
         cd bitcoin
 
 2.  Build bitcoind: