Fix ambiguous native dependencies in proc_macros and staticlibs
#1611
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rustcdoesn't know how to deal with native dependencies that have the same name (specifying the full path to the native library does not currently work).rules_rustdeals with this issue inbinandcdylibcrate types by appending a hash to the different dependencies, so instead of-lnative-dep -lnative-depthe linking command line ends up being-lnative-dep-{hash1} -lnative-dep-{hash2}. This PR also applies the mechanism tostaticlibandproc-macrocrate types.