scripts/package-metadata.pl: remove broken detection of self-dependencies

A self-dependency is not an error worth a warning; rather, it is very
common: whenever there are dependencies between different binary packages
originating from the same source package, such dependencies occur. Not
actually generating dependency rules is correct, but already handled a few
lines below.

A typo prevented this redundant rule from working, which is the reason the
warning was not actually printed.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

scripts/package-metadata.pl

@@ -535,11 +535,6 @@ sub gen_package_mk() {
 							$pkg->{makefile}, $pkg_dep->{src}, $deptype, $pkg_dep->{makefile}, $deptype;
 						next;
 					}
-					unless ($pkg->{src} ne $pkg_dep->{sec}.$suffix) {
-						warn sprintf "WARNING: Makefile '%s' has a build dependency on itself\n",
-							$pkg->{makefile};
-						next;
-					}
 					$idx = $pkg_dep->{subdir}.$pkg_dep->{src};
 				} elsif (defined($srcpackage{$dep})) {
 					$idx = $subdir{$dep}.$dep;