Set HEAD extensions version string

Signed-off-by: andrew-m-leonard <[email protected]>

Author: andrew-m-leonard

jdk/make/closed/autoconf/custom-spec.gmk.in

@@ -57,7 +57,8 @@ OPENJDK_TAG             := @OPENJDK_TAG@
 
 JDK_MOD_VERSION         := @JDK_MOD_VERSION@
 JDK_FIX_VERSION         := @JDK_FIX_VERSION@
-J9JDK_EXT_VERSION       := ${JDK_MINOR_VERSION}.${JDK_MICRO_VERSION}.${JDK_MOD_VERSION}.${JDK_FIX_VERSION}
+# J9JDK_EXT_VERSION := ${JDK_MINOR_VERSION}.${JDK_MICRO_VERSION}.${JDK_MOD_VERSION}.${JDK_FIX_VERSION}
+J9JDK_EXT_VERSION       := HEAD
 J9JDK_EXT_NAME          := Extensions for OpenJDK for Eclipse OpenJ9
 
 # required by UMA