hg: jdk9/hs-rt/hotspot: 8138733: Fix build: gcc < 4.8 doesn't grok -Wno-format-zero-length added in 8080775

[david.lindholm at oracle.com]

Changeset: 17986acb4825
Author:    goetz
Date:      2015-10-02 11:46 +0200
URL:       http://hg.openjdk.java.net/jdk9/hs-rt/hotspot/rev/17986acb4825

8138733: Fix build: gcc < 4.8 doesn't grok -Wno-format-zero-length added in 8080775
Summary: Also fix one problematic format on ppc.
Reviewed-by: david, simonis

! make/linux/makefiles/gcc.make
! src/cpu/ppc/vm/stubGenerator_ppc.cpp
! src/share/vm/utilities/debug.hpp