RFR: JDK-8145008: Add libelf package to Linux devkit

[Erik Joelsson]

The devkit used for building OracleJDK on linux needs to add libelf. 
Here is the patch to the devkit creation makefiles to make that happen.

Bug: https://bugs.openjdk.java.net/browse/JDK-8145008
Patch:
diff --git a/make/devkit/Tools.gmk b/make/devkit/Tools.gmk
--- a/make/devkit/Tools.gmk
+++ b/make/devkit/Tools.gmk
@@ -82,7 +82,9 @@
      libXi libXi-devel \
      libXdmcp libXdmcp-devel \
      libXau libXau-devel \
-    libgcc
+    libgcc \
+    elfutils elfutils-devel \
+    elfutils-libelf elfutils-libelf-devel


  ifeq ($(ARCH),x86_64)


/Erik