cc_fuzztest_grammar_library bazel macro cannot be used outside of com_google_fuzztest repo

[racko]

# some/package/BUILD
load("@com_google_fuzztest//build_defs:cc_fuzztest_grammar_library.bzl", "cc_fuzztest_grammar_library")


cc_fuzztest_grammar_library(
    name = "some_grammar",                                                    
    srcs = ["some_grammar.g4"],                                                       
    top_level_rule = "some_rule",                                                      
)

results in

ERROR: no such package 'fuzztest': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
 - /path/to/my/workspace/fuzztest
ERROR: /path/to/my/workspace/some/package/BUILD:122:28: no such package 'fuzztest': BUILD file not found in any of the following directories. Add a BUILD file to a directory to mark it as a package.
 - /path/to/my/workspace/fuzztest and referenced by '//some/package:some_grammar'
ERROR: Analysis of target '//some/package:some_grammar' failed; build aborted: Analysis failed

The linked PR fixes the issue.

[racko]

#1257 🤔