Use llvm-nm instead of cctools nm

Since Xcode 7, Xcode has been using llvm-nm to provide the nm tool.

Dockerfile

@@ -16,7 +16,7 @@ RUN set -x \
   && mv clang+llvm-5.0.0-linux-x86_64-ubuntu16.04 clang \
   && cd clang \
   && mkdir bin-new \
-  && mv bin/clang-5.0 bin/clang bin/clang++ bin/llvm-dsymutil bin-new \
+  && mv bin/clang-5.0 bin/clang bin/clang++ bin/llvm-dsymutil bin/llvm-nm bin-new \
   && rm -rf bin \
   && mv bin-new bin \
   && rm -rf lib/*.a lib/*.so lib/*.so.* lib/clang/5.0.0/lib/linux

setup-symlinks.sh

@@ -12,13 +12,13 @@ CCTOOLS="$3"
 
 ARCHS="i386 x86_64 armv7 arm64"
 mkdir -p $PREFIX/bin
-for tool in clang clang++ cc gcc c++ g++; do
+for tool in clang clang++ cc gcc c++ g++ nm; do
 	for arch in $ARCHS; do
 		ln -sf $DEVELOPER_DIR/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/$tool $PREFIX/bin/$arch-apple-darwin-$tool
 	done
 	ln -sf $DEVELOPER_DIR/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/$tool $PREFIX/bin/apple-darwin-$tool
 done
-for tool in ar as ld nm ranlib strings strip; do
+for tool in ar as ld ranlib strings strip; do
 	for arch in $ARCHS; do
 		ln -sf $CCTOOLS/bin/$tool $PREFIX/bin/$arch-apple-darwin-$tool
 	done

setup-toolchain.sh

@@ -90,6 +90,7 @@ ln -sf clang gcc
 ln -sf clang g++
 
 ln -s $CLANG/bin/llvm-dsymutil dsymutil
+ln -s $CLANG/bin/llvm-nm nm
 
 cd ../lib
 mkdir -p $CLANG/lib/arc