(cmp_kernel_versions) move it from any.pm to common.pm; thus preventing lazy loading of syscall.ph through

any->detect_devices>modules>list_modules>MDK::Common>MDK::Common::System>syscall.ph

This can end in crashing mgaaplet when performing live update (mga#3042)
because of lazy loading of syscall (by which time perl may as well have been
updated including syscall.ph which leave eg perl/5.12.x for perl/5.14.x)

This also saves quite some memory for:
- net_applet (5Mb aka 11%),
- mgapplet (7Mb aka 14%)
(as well as maybe for drakxnet but that's more transient):

21736 root      20   0  240m  44m  10m S    0  1.1   0:00.63 net_applet                                                                                               
21501 root      20   0  236m  39m  11m S    0  1.0   0:01.09 net_applet    

23116 root      20   0  297m  50m  12m S    0  1.3   0:00.58 mgaapplet                                                                                                
23259 root      20   0  290m  43m  12m S    0  1.1   0:00.40 mgaapplet     

1 files changed, 12 insertions, 0 deletions

diff --git a/perl-install/common.pm b/perl-install/common.pm
index adaa07a0d..7aea9bc17 100644
--- a/perl-install/common.pm
+++ b/perl-install/common.pm
@@ -488,4 +488,16 @@ sub update_gnomekderc_no_create {
     }
 }
 
+sub cmp_kernel_versions {
+    my ($va, $vb) = @_;
+    my $rel_a = $va =~ s/-(.*)$// && $1;
+    my $rel_b = $vb =~ s/-(.*)$// && $1;
+    ($va, $vb) = map { [ split /[.-]/ ] } $va, $vb;
+    my $r = 0;
+    mapn_ {
+	$r ||= $_[0] <=> $_[1];
+    } $va, $vb;
+    $r || $rel_a <=> $rel_b || $rel_a cmp $rel_b;
+}
+
 1;