`argon2`, `gmp`, and `softfloat` have "no symbols" (linker warnings on `macos-x86_64`)

[matthew-levan]

Describe the bug

"has no symbols" linker warnings for these libraries occur when building with bazel build //... on macos-x86_64:

INFO: From Linking external/argon2/libargon2.a:
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/argon2/libargon2.a(thread.o) has no symbols
...
INFO: From Linking external/softfloat/softfloat.a:
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_countLeadingZeros16.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_countLeadingZeros32.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_countLeadingZeros64.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_mul64ByShifted32To128.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_mul64To128.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_mul128By32.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: bazel-out/darwin-fastbuild/bin/external/softfloat/libsoftfloat_x86_64.a(s_mul128To256M.o) has no symbols

Expected behaviour

The libraries don't generate symbols in these files on linux-x86_64 either, so there's no error. We'd just like to suppress the warnings.

Additional context

I will add more context next week.