Manpages of src:emscripten in Debian experimental

• em++(1)
• emar(1)
• embuilder(1)
• emcc(1)
• emdump(1)
• emdwp(1)
• emnm(1)
• emprofile(1)
• emranlib(1)
• emrun(1)
• emsize(1)