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/suffix.go

@@ -0,0 +1,35 @@
+package match
+
+import (
+	"fmt"
+	"strings"
+)
+
+type Suffix struct {
+	Suffix string
+}
+
+func NewSuffix(s string) Suffix {
+	return Suffix{s}
+}
+
+func (self Suffix) Len() int {
+	return lenNo
+}
+
+func (self Suffix) Match(s string) bool {
+	return strings.HasSuffix(s, self.Suffix)
+}
+
+func (self Suffix) Index(s string) (int, []int) {
+	idx := strings.Index(s, self.Suffix)
+	if idx == -1 {
+		return -1, nil
+	}
+
+	return 0, []int{idx + len(self.Suffix)}
+}
+
+func (self Suffix) String() string {
+	return fmt.Sprintf("<suffix:%s>", self.Suffix)
+}