depends: Remove -fuse-ld line

clang warns when a command line option is unused, and some of our tests
use Werror, so unfortunately we cannot use this flag to pin our linker
for now. Leaving this commit in for future reference, as it would be
great if there's more granularity to Werror and we can be explicit about
what linker we want to use.

Author: dongcarl

depends/hosts/darwin.mk

@@ -64,7 +64,6 @@ darwin_CC=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
               -u LIBRARY_PATH \
             clang --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
               -B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
-              -fuse-ld=$(build_prefix)/bin/x86_64-apple-darwin16-ld \
               --sysroot=$(OSX_SDK) \
               -Xclang -internal-externc-isystem$(clang_resource_dir)/include \
               -Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
@@ -73,7 +72,6 @@ darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
                -u LIBRARY_PATH \
              clang++ --target=$(host) -mmacosx-version-min=$(OSX_MIN_VERSION) \
                -B$(build_prefix)/bin -mlinker-version=$(LD64_VERSION) \
-               -fuse-ld=$(build_prefix)/bin/x86_64-apple-darwin16-ld \
                --sysroot=$(OSX_SDK) \
                -stdlib=libc++ -nostdinc++ \
                -Xclang -cxx-isystem$(OSX_SDK)/usr/include/c++/v1 \