Add R_X86_64_64 to the list of possible weak relocs

Change-Id: I768a5948d89701a1719734954a3524d3c7187e6a
Signed-off-by: Pavel Chupin <pavel.v.chupin@intel.com>
diff --git a/linker/linker.cpp b/linker/linker.cpp
index c5006e0..38ae546 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -889,6 +889,7 @@
         case R_X86_64_JUMP_SLOT:
         case R_X86_64_GLOB_DAT:
         case R_X86_64_32:
+        case R_X86_64_64:
         case R_X86_64_RELATIVE:
           // No need to do anything.
           break;