DCE compatible Universally Unique Identifier library for Perl

Changes for 0.30

• Make all devel version use UUID_DEBUG=1.
• Bump ExtUtils::MakeMaker prereq to 6.64 (first version supporting TEST_REQUIRES).
• Add debug message to show current Devel::CheckLib::VERSION.
• Add debug message to show current ExtUtils::MakeMaker::VERSION.
• Reorder configure tests for win32.
• Add RPC_CSTR typedef for older Win32.
• Define UuidCreateSequential() for older Win32.
• Make META.json and META.yml placeholders. Generate during distdir.
• Make README a placeholder. Generate during distdir.
• Fix trivial build warning.