Need to consider blender-v* a release branch, not just blender-

This is because of blender-tiles branch we've got..

build_files/cmake/buildinfo.cmake

@@ -85,7 +85,7 @@ if(EXISTS ${SOURCE_DIR}/.git)
 				endif()
 			endif()
 
-			if(MY_WC_BRANCH MATCHES "^blender-")
+			if(MY_WC_BRANCH MATCHES "^blender-v")
 				set(MY_WC_BRANCH "master")
 			endif()
 

build_files/scons/tools/Blender.py

@@ -457,7 +457,7 @@ def buildinfo(lenv, build_type):
                 unpushed_log = os.popen('git log --oneline @{u}..').read().strip()
                 has_local_changes = unpushed_log != ''
 
-            if build_branch.startswith('blender-'):
+            if build_branch.startswith('blender-v'):
                 build_branch = 'master'
 
             if has_local_changes: