cmd/go/internal/work: allow single character values in -Wl, linker flags

[t0rr3sp3dr0]

Allow single character values in -Wl, linker flags by modifying the regular
expressions to use the star operator instead of the plus operator.

Fixes #70924

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Patch Set 1:

(1 comment)

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Message from Pedro Tôrres:

Patch Set 1:

(1 comment)

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Message from Ian Lance Taylor:

Patch Set 2: Commit-Queue+1

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Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-12-21T02:20:13Z","revision":"cc96aafbb8c18e31c3a5068c2dbcfea6b46748da"}

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Patch Set 2: -Commit-Queue

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Patch Set 2: LUCI-TryBot-Result+1

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