Some fixes for Raspberry Pi.

app/build.gradle

@@ -7,17 +7,18 @@ task createVersionXML {
 	doLast {
         def versionP = 'git describe --tags --long --dirty=-x --abbrev=8'
 						.execute()
+		versionP.waitFor()
         def version = versionP.text.trim()
 		if ( versionP.exitValue() )
 			throw new GradleException("Couldn't extract version. Git exited unexpectedly.")
 
         def githashP = 'git rev-parse HEAD'.execute()
+		githashP.waitFor()
         def githash = githashP.text.trim()
 		if ( githashP.exitValue() )
 			throw new GradleException("Couldn't extract git_hash. Git exited unexpectedly.")
 		
 		def builddate = new Date()
-
 	    def versionFile = new FileWriter("app/src/main/res/values/version.xml")
 		versionFile.println( '<?xml version="1.0" encoding="utf-8"?>' )
 		versionFile.println( '<resources>' )