libc-bench: It works fine with new way of choosing llvm runtime

Signed-off-by: Khem Raj <raj.khem@gmail.com>

conf/nonclangable.conf

@@ -298,19 +298,16 @@ LDFLAGS_append_pn-qemu_toolchain-clang_runtime-gnu_x86 = " -latomic"
 # glibc is built with gcc and hence encodes some libgcc specific builtins which are not found
 # when doing static linking with clang using compiler-rt, so use libgcc
 # undefined reference to `__unordtf2'
-COMPILER_RT_pn-libc-bench_libc-glibc_toolchain-clang_x86 = "-rtlib=libgcc"
 COMPILER_RT_pn-aufs-util_libc-glibc_toolchain-clang_x86 = "-rtlib=libgcc"
 COMPILER_RT_pn-libhugetlbfs_libc-glibc_toolchain-clang_x86 = "-rtlib=libgcc"
 COMPILER_RT_pn-tsocks_libc-glibc_toolchain-clang_x86 = "-rtlib=libgcc"
-COMPILER_RT_pn-libc-bench_libc-glibc_toolchain-clang_x86-64 = "-rtlib=libgcc"
 COMPILER_RT_pn-aufs-util_libc-glibc_toolchain-clang_x86-64 = "-rtlib=libgcc"
 COMPILER_RT_pn-libhugetlbfs_libc-glibc_toolchain-clang_x86-64 = "-rtlib=libgcc"
 COMPILER_RT_pn-tsocks_libc-glibc_toolchain-clang_x86-64 = "-rtlib=libgcc"
 
 #(unwind.o): in function `__pthread_unwind':
 #/usr/src/debug/glibc/2.29-r0/git/nptl/unwind.c:121: undefined reference to `_Unwind_ForcedUnwind'
 #clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
-COMPILER_RT_pn-libc-bench_libc-glibc_toolchain-clang_arm = "-rtlib=libgcc"
 COMPILER_RT_pn-aufs-util_libc-glibc_toolchain-clang_arm = "-rtlib=libgcc"
 COMPILER_RT_pn-libhugetlbfs_libc-glibc_toolchain-clang_arm = "-rtlib=libgcc"