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/match/nothing_test.go

@@ -0,0 +1,54 @@
+package match
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestNothingIndex(t *testing.T) {
+	for id, test := range []struct {
+		fixture  string
+		index    int
+		segments []int
+	}{
+		{
+			"abc",
+			0,
+			[]int{0},
+		},
+		{
+			"",
+			0,
+			[]int{0},
+		},
+	} {
+		p := NewNothing()
+		index, segments := p.Index(test.fixture)
+		if index != test.index {
+			t.Errorf("#%d unexpected index: exp: %d, act: %d", id, test.index, index)
+		}
+		if !reflect.DeepEqual(segments, test.segments) {
+			t.Errorf("#%d unexpected segments: exp: %v, act: %v", id, test.segments, segments)
+		}
+	}
+}
+
+func BenchmarkIndexNothing(b *testing.B) {
+	m := NewNothing()
+
+	for i := 0; i < b.N; i++ {
+		_, s := m.Index(bench_pattern)
+		releaseSegments(s)
+	}
+}
+
+func BenchmarkIndexNothingParallel(b *testing.B) {
+	m := NewNothing()
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			_, s := m.Index(bench_pattern)
+			releaseSegments(s)
+		}
+	})
+}