Add workaround for Issue #60

syncqt.pl won't be called by qmake if .git directory or file doesn't
exist.
We manual set git_build flag here.

Otherwise, syncqt.pl should be called before we release .zip/.tar.gz
package.

.qmake.conf

@@ -1,3 +1,6 @@
+#Workaround for Issue #60
+CONFIG += git_build
+
 load(qt_build_config)
 
 MODULE_VERSION = 0.3.0