cmd/gc: make forward declaration in pure Go package an error
An error during the compilation can be more precise than an error at link time. For 'func init', the error happens always: you can't forward declare an init func because the name gets mangled. For other funcs, the error happens only with the special (and never used by hand) -= flag, which tells 6g the package is pure go. The go command now passes -= for pure Go packages. Fixes #3705. R=ken2 CC=golang-dev https://golang.org/cl/6996054
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