sysinfo: Display git head sha1

Now Vinegar is built with head's latest commit sha, which is shown in sysinfo's output. 
If the sha can't be determined (for instance, if vinegar was built from a tarball with no git info), it's displayed as N/A

Makefile

@@ -9,9 +9,10 @@ FLATPAK = io.github.vinegarhq.Vinegar
 
 GO = go
 GO_LDFLAGS = -s -w
+GIT_HEAD = $(shell git log -1 --pretty=format:"%H")
 
 VINEGAR_ICONPATH = $(ICONPREFIX)/64x64/apps/$(FLATPAK).png
-VINEGAR_LDFLAGS = $(GO_LDFLAGS) -X main.BinPrefix=$(BINPREFIX) -X main.Version=$(VERSION)
+VINEGAR_LDFLAGS = $(GO_LDFLAGS) -X main.BinPrefix=$(BINPREFIX) -X main.Version=$(VERSION) -X main.GitHead=$(GIT_HEAD)
 VINEGAR_GOFLAGS = --tags nowayland,novulkan
 
 all: vinegar robloxmutexer.exe

cmd/vinegar/vinegar.go

@@ -22,6 +22,7 @@ import (
 var (
 	BinPrefix string
 	Version   string
+	GitHead   string
 )
 
 func usage() {
@@ -130,21 +131,27 @@ func Delete() {
 }
 
 func Sysinfo(pfx *wine.Prefix) {
+	fmtHead := GitHead
+
+	if fmtHead == "" {
+		fmtHead = "N/A"
+	}
+
 	cmd := pfx.Wine("--version")
 	cmd.Stdout = nil // required for Output()
 	ver, err := cmd.Output()
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	info := `* Vinegar: %s
+	info := `* Vinegar: %s (%s)
 * Distro: %s
 * Processor: %s
   * Supports AVX: %t
 * Kernel: %s
 * Wine: %s`
 
-	fmt.Printf(info, Version, sysinfo.Distro, sysinfo.CPU, sysinfo.HasAVX, sysinfo.Kernel, ver)
+	fmt.Printf(info, Version, fmtHead, sysinfo.Distro, sysinfo.CPU, sysinfo.HasAVX, sysinfo.Kernel, ver)
 	if sysinfo.InFlatpak {
 		fmt.Println("* Flatpak: [x]")
 	}