Update spec file to support building alpha versions.

fldigi.spec

@@ -1,3 +1,6 @@
+# For test builds, should be set to 0 for release builds.
+%global alpha 0
+
 Name:           fldigi
 Version:        4.1.17
 Release:        1%{?dist}
@@ -5,7 +8,12 @@ Summary:        Digital modem program for Linux
 
 License:        GPLv3+  
 URL:            http://www.w1hkj.com/Fldigi.html
+%if %{alpha}
+Source0:        http://www.w1hkj.com/alpha/%{name}/%{name}-%{version}.tar.gz
+%else
 Source0:        http://www.w1hkj.com/files/%{name}/%{name}-%{version}.tar.gz
+%endif
+
 Source100:      fldigi.appdata.xml
 
 #BuildRequires:  automake autoconf libtool