cmd/gogio: restore package path handling

A previous change converted the package argument to gogio to an absolute path.
However, gogio supports all package paths that may appear in Go import statements.
For example, the path "gioui.org/cmd/example/kitchen" should not be converted.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

cmd/gogio/main.go

@@ -46,7 +46,7 @@ func main() {
 		fmt.Fprintf(os.Stderr, "gogio: %v\n", err)
 		os.Exit(1)
 	}
-	buildInfo, err := newBuildInfo(getPkgAbsPath())
+	buildInfo, err := newBuildInfo(flag.Arg(0))
 	if err != nil {
 		fmt.Fprintf(os.Stderr, "gogio: %v\n", err)
 		os.Exit(1)
@@ -63,9 +63,6 @@ func flagValidate() error {
 	if pkgPathArg == "" {
 		return errors.New("specify a package")
 	}
-	if _, err := filepath.Abs(pkgPathArg); err != nil {
-		return err
-	}
 	if *target == "" {
 		return errors.New("please specify -target")
 	}