Bump to R38 for respin

Change-Id: Ibcb98ee277de5091a75d32e38c1fdef108e6b356
diff --git a/build.gradle b/build.gradle
index 4cc4f89..caceb4d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -31,7 +31,7 @@
 }
 
 ext.supportVersion = '24.2.1'
-ext.extraVersion = 37
+ext.extraVersion = 38
 ext.supportRepoOut = ''
 ext.buildToolsVersion = '23.0.2'
 ext.buildNumber = Integer.toString(ext.extraVersion)