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/max.go

@@ -0,0 +1,49 @@
+package match
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+type Max struct {
+	Limit int
+}
+
+func NewMax(l int) Max {
+	return Max{l}
+}
+
+func (self Max) Match(s string) bool {
+	var l int
+	for range s {
+		l += 1
+		if l > self.Limit {
+			return false
+		}
+	}
+
+	return true
+}
+
+func (self Max) Index(s string) (int, []int) {
+	segments := acquireSegments(self.Limit + 1)
+	segments = append(segments, 0)
+	var count int
+	for i, r := range s {
+		count++
+		if count > self.Limit {
+			break
+		}
+		segments = append(segments, i+utf8.RuneLen(r))
+	}
+
+	return 0, segments
+}
+
+func (self Max) Len() int {
+	return lenNo
+}
+
+func (self Max) String() string {
+	return fmt.Sprintf("<max:%d>", self.Limit)
+}