hg: jdk/sandbox: 8243059: Build fails when --with-vendor-name contains a comma

[chris.hegarty at oracle.com]

Changeset: dff3aabdc2f3
Author:    sgehwolf
Date:      2020-04-17 11:14 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/dff3aabdc2f3

8243059: Build fails when --with-vendor-name contains a comma
Summary: Use $$(VERSION_CFLAGS) so as to avoid the variable getting evaluated early
Reviewed-by: ihse, erikj

! make/launcher/LauncherCommon.gmk