RFR: JDK-8169255: Link gtestLauncher statically if libjvm is configured for static linking

[Erik Joelsson]

In the build, we have a global setting for linking libstdc++ static or 
dynamic on Linux. All libraries and executables that go in the product 
honor this setting. The gtestLauncher currently doesn't. This causes 
trouble in testing where some machines might not have the 32bit 
libstdc++.so installed. Since installing that library is not needed for 
just running the product, it's awkward to have to install it to run 
certain tests.

This patch adds the LIBCXX flags from configure when linking 
gtestLauncher. The resulting file actually comes out a little bit 
smaller, so there is no footprint overhead. The tests still pass.

Bug: https://bugs.openjdk.java.net/browse/JDK-8169255

Patch:

diff -r 246f6fb74bf1 make/lib/CompileGtest.gmk
--- a/make/lib/CompileGtest.gmk
+++ b/make/lib/CompileGtest.gmk
@@ -107,6 +107,7 @@
      LDFLAGS := $(LDFLAGS_JDKEXE), \
      LDFLAGS_unix := -L$(JVM_OUTPUTDIR)/gtest $(call 
SET_SHARED_LIBRARY_ORIGIN), \
      LDFLAGS_solaris := -library=stlport4, \
+    LIBS_linux := $(LIBCXX), \
      LIBS_unix := -ljvm, \
      LIBS_windows := $(JVM_OUTPUTDIR)/gtest/objs/jvm.lib, \
      COPY_DEBUG_SYMBOLS := $(GTEST_COPY_DEBUG_SYMBOLS), \


/Erik