Makefile: remove legacy trimpath code #4938
Merged
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Before Go 1.13, it was possible to trim paths with GC flags and ASM flags. In Go 1.13, it became possible to simply specify -trimpath, at which point all the old behaviour became unnecessary.
Since we require Go 1.13 in our code due to the use of the errors package, let's simplify our code by always using the -trimpath flag and omitting the old forms. The old forms additionally were broken when using a path with a space, which could happen on Windows if the current user's username contained a space (which is not uncommon).