some files in gyp source have no license infomration in the header or are 
explicitly "All rights reserved" only.

Please fix this, so gyp can enter the ubuntu/debian repository.

Files without license info (I know, some are trivial, but still, adding 
that info would help):

tools/pretty_sln.py
tools/pretty_vcproj.py
test/defines/defines.c
test/dependencies/a.c
test/hello/hello2.c
test/hello/hello.c
test/rules-rebuild/gyptest-all.py
test/rules-rebuild/gyptest-default.py
test/scons_tools/tools.c
test/toolsets/main.cc test/toolsets/toolsets.cc 
test/variables/update_golden
gyp_dummy.c
setup.py