Require Alien::libudev on Linux

Fixes #2.

Author: a3f

alienfile

@@ -40,8 +40,8 @@ share {
     if ($^O eq 'linux') {
         requires 'Alien::libudev' => '0.1';
         eval "use Alien::libudev"; die $@ if $@;
-        $cppflags  = Alien::libudev->cflags;
-        $ldflags   = Alien::libudev->libs;
+        $cppflags  = Alien::libudev->cflags // '';
+        $ldflags   = Alien::libudev->libs // '';
 
         meta->after_hook(gather_share => sub {
             my($build) = @_;

dist.ini

@@ -5,6 +5,8 @@ copyright_holder = Ahmad Fatoum
 copyright_year   = 2017
 
 [AutoPrereqs]
+[OSPrereqs / linux]
+Alien::libudev = 0.14
 
 [@Starter]
 
@@ -29,3 +31,9 @@ user    = athreef
 [Git::NextVersion]
 first_version = 0.2
 [ChangelogFromGit]
+
+;[Git::CommitBuild]
+[MinimumPerl]
+[Test::MinimumVersion]
+max_target_perl = 5.8
+[Test::Compile]