hg: jdk-updates/jdk13u-dev: 8243059: Build fails when --with-vendor-name contains a comma

[abrygin at azul.com]

Changeset: ff04998b91a3
Author:    sgehwolf
Date:      2020-04-17 11:14 +0200
URL:       https://hg.openjdk.java.net/jdk-updates/jdk13u-dev/rev/ff04998b91a3

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