enhance write_fake_manifest.py
Add an option to write_fake_manifest.py to generate sources expected by the
manifest. Also slightly adapt command lines to the called commands. Together
these changes mean that generated manifest can actually be executed
successfully on Linux and OSX. Also add command line options to to change the
number of targets being generated and the seed for the random number generator.
Example usage:
# create build directory in fake/build, sources in fake/src
$ python misc/write_fake_manifest.py -s ../src fake/build
# execute build in fake/build
$ ninja -C fake/build
1 file changed
