build.sh: fixed git revision request

$project was initialized before GetBuildNumber, so function didn't work

Author: gildor2

build.sh

@@ -55,6 +55,7 @@ function DebugPrint()
 
 function SetupDefaultProject()
 {
+	is_default_project=1
 	project="UmodelTool/umodel"
 	root="."
 	render=1
@@ -99,7 +100,7 @@ function GetBuildNumber()
 	[ -f "$version_file" ] && [ "$revision" ] && read last_revision < $version_file
 	local last_revision=${last_revision##* }		# cut "#define ..."
 	# write back to a file if value differs or if file doesn't exist (only for UModel project, i.e. when $project is empty)
-	[ -z "$project" ] && [ "$last_revision" != "$revision" ] && echo "#define GIT_REVISION $revision" > $version_file
+	[ "$is_default_project" ] && [ "$last_revision" != "$revision" ] && echo "#define GIT_REVISION $revision" > $version_file
 }
 
 #-------------------------------------------------------------