lib/ignore: Replace lib/fnmatch with github.com/gobwas/glob

Because it's literally ten times faster:



	benchmark                  old ns/op     new ns/op     delta

	BenchmarkMatch-8           13842         1200          -91.33%

	BenchmarkMatchCached-8     139           147           +5.76%



	benchmark                  old allocs     new allocs     delta

	BenchmarkMatch-8           0              0              +0.00%

	BenchmarkMatchCached-8     0              0              +0.00%



	benchmark                  old bytes     new bytes     delta

	BenchmarkMatch-8           12            0             -100.00%

	BenchmarkMatchCached-8     0             0             +0.00%

vendor/github.com/gobwas/glob/strings/strings.go

@@ -0,0 +1,13 @@
+package strings
+
+import "strings"
+
+func IndexAnyRunes(s string, rs []rune) int {
+	for _, r := range rs {
+		if i := strings.IndexRune(s, r); i != -1 {
+			return i
+		}
+	}
+
+	return -1
+}