Don't gate force/unforce on wrap_proc_macro #233
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This allows a non-macro tool that uses
proc-macro2 = { default-features = false }to contain an unconditional call toproc_macro2::fallback::force()(#220). Previously, such a tool would either need to not usedefault-features = false, or not useproc_macro2::fallback::force()and hope that nothing else in the dependency graph enables proc-macro2's default feature.