Update Build.sh

This is a fix for pkg-config on Fedora 19 which adds a space and newline at the end of the `pkg-config --libs-only-L libzmq` command.


[tim@titanium ~]$ cat /etc/redhat-release
Fedora release 19 (Schrödinger’s Cat)
[tim@titanium ~]$ pkg-config --libs-only-L libzmq|hexdump
0000000 0a20                                   
0000002
[tim@titanium ~]$ printf " \n"| hexdump
0000000 0a20                                   
0000002