Fix runtime linkage with libasan in Facebook platform009 (#8402)

Summary:
Was seeing

    ./cache_test: error while loading shared libraries: libasan.so.5: cannot open shared object file: No such file or directory

etc. using COMPILE_WITH_ASAN=1 without USE_CLANG=1

Now including compiler libs in runtime ld path.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8402

Test Plan: reproduced with local builds

Reviewed By: akankshamahajan15

Differential Revision: D29107729

Pulled By: pdillinger

fbshipit-source-id: 13805b87b846b39522c9dd6a231ca245c58f1c71

build_tools/fbcode_config_platform009.sh

@@ -154,6 +154,7 @@ EXEC_LDFLAGS+=" -B$BINUTILS"
 EXEC_LDFLAGS+=" -Wl,--dynamic-linker,/usr/local/fbcode/platform009/lib/ld.so"
 EXEC_LDFLAGS+=" $LIBUNWIND"
 EXEC_LDFLAGS+=" -Wl,-rpath=/usr/local/fbcode/platform009/lib"
+EXEC_LDFLAGS+=" -Wl,-rpath=$GCC_BASE/lib64"
 # required by libtbb
 EXEC_LDFLAGS+=" -ldl"