winapi_test: Improve the usage message.

[Francois Gouget]

---

Actually say what the tool does.
(and an uppercase 'U' seems more customary)

 tools/winapi/winapi_test_options.pm |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/tools/winapi/winapi_test_options.pm b/tools/winapi/winapi_test_options.pm
index 25e3a6b..240e840 100644
--- a/tools/winapi/winapi_test_options.pm
+++ b/tools/winapi/winapi_test_options.pm
@@ -46,7 +46,7 @@ my %options_short = (
     "v" => "verbose"
 );
 
-my $options_usage = "usage: winapi_test [--help]\n";
+my $options_usage = "Usage: winapi_test [--help]\n\nGenerates tests checking the size and alignment of the Windows structures.\n\n";
 
 $options = '_options'->new(\%options_long, \%options_short, $options_usage);
 
-- 
1.5.6.5