sodepends: fix listing binaries, check libdepends, libprovides

• This fixes the problem when a library is needed by multiple binaries in a package, and only the last binary was listed, because the previous list was overridden on every scan.
• Check the sonames provided by the package and compare it with provides=() specified in PKGBUILD. Warn if provided but not specified, error if specified but not provided.
• Check the sonames required by the package and compare it with depends=() specified in PKGBUILD. Warn if a package provides a requred soname but not specified, and if a specified soname is not needed.

Namcap/rules/sodepends.py

@@ -52,8 +52,8 @@ def scanlibs(fileobj, filename, custom_libs, sharedlibs, libprovides):
 		for tag in section.iter_tags():
 			# DT_SONAME means it provides a library; ignore unversioned (mostly internal) libraries
 			if tag.entry.d_tag == 'DT_SONAME' and not tag.soname.endswith('.so'):
-				libname = tag.soname.rsplit('.so', 1)[0] + '.so'
-				libprovides[libname].add(filename)
+				soname = tag.soname.rsplit('.so', 1)[0] + '.so'
+				libprovides[soname].add(filename)
 			# DT_NEEDED means shared library
 			if tag.entry.d_tag != 'DT_NEEDED':
 				continue