scancpan: fix detection of native module

When a module is native or depends of a native module, it must be
disabled for static builds via its Config.in

We detect native modules by looking at the filenames listed in the
MANIFEST. If there is a file which looks like it contains code that
much be compiled (e.g. .c, .h and so on...), then we exclude that
module (and its dependencies) from static builds.

That's what we tried to do so far, but failed when there was a
comment on the same line as the filename in the manifest, like so:
    foo-bar.c # Bla bla bla

Fix that by detecting either endof-line (as currently done) or
end-of-string.

For an example of failed build of perl-html-parser, see
http://autobuild.buildroot.net/results/128/128671dfa23d843698a63220c2fac1f44e1d5845/

[Thomas: use better commit log proposed by Yann E. Morin.]

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/perl-html-parser/Config.in

@@ -1,8 +1,12 @@
 config BR2_PACKAGE_PERL_HTML_PARSER
 	bool "perl-html-parser"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_PERL_HTML_TAGSET
 	help
 	  The HTML-Parser distribution is is a collection of modules that parse
 	  and extract information from HTML documents
 
 	  http://github.com/gisle/html-parser
+
+comment "perl-html-parser needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

package/perl-libwww-perl/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_PERL_LIBWWW_PERL
 	bool "perl-libwww-perl"
+	depends on !BR2_STATIC_LIBS
 	select BR2_PACKAGE_PERL_ENCODE_LOCALE
 	select BR2_PACKAGE_PERL_FILE_LISTING
 	select BR2_PACKAGE_PERL_HTML_PARSER
@@ -16,3 +17,6 @@ config BR2_PACKAGE_PERL_LIBWWW_PERL
 	  The World-Wide Web library for Perl
 
 	  https://metacpan.org/release/libwww-perl
+
+comment "perl-libwww-perl needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

package/perl-mime-base64/Config.in

@@ -1,7 +1,11 @@
 config BR2_PACKAGE_PERL_MIME_BASE64
 	bool "perl-mime-base64"
+	depends on !BR2_STATIC_LIBS
 	help
 	  This package contains a base64 encoder/decoder and a quoted-printable
 	  encoder/decoder.
 
 	  http://github.com/gisle/mime-base64
+
+comment "perl-mime-base64 needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

package/perl-time-hires/Config.in

@@ -1,6 +1,10 @@
 config BR2_PACKAGE_PERL_TIME_HIRES
 	bool "perl-time-hires"
+	depends on !BR2_STATIC_LIBS
 	help
 	  High resolution alarm, sleep, gettimeofday, interval timers
 
 	  http://search.cpan.org/dist/Time-HiRes/HiRes.pm
+
+comment "perl-time-hires needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS

support/scripts/scancpan

@@ -534,7 +534,7 @@ sub is_xs {
     # This heuristic determines if a module is a native extension, by searching
     # some file extension types in the MANIFEST of the distribution.
     # It was inspired by http://deps.cpantesters.org/static/purity.html
-    return $manifest =~ m/\.(swg|xs|c|h|i)\n/;
+    return $manifest =~ m/\.(swg|xs|c|h|i)[\n\s]/;
 }
 
 sub find_license_files {