hg: code-tools/jtreg: fix issues displaying jtreg splash screen in gui mode

[jonathan.gibbons at oracle.com]

Changeset: 2704bf642146
Author:    jjg
Date:      2018-02-05 15:23 -0800
URL:       http://hg.openjdk.java.net/code-tools/jtreg/rev/2704bf642146

fix issues displaying jtreg splash screen in gui mode

! make/Rules.gmk
! make/jtreg.gmk
+ src/share/classes/com/sun/javatest/regtest/tool/Startup.java
! src/share/classes/com/sun/javatest/regtest/tool/Tool.java
+ src/share/classes/com/sun/javatest/regtest/tool/jtlogo.gif