Moving to a ninja-based build system

LICENSE.md

@@ -122,40 +122,6 @@ to assume any extra rights that may not actually be granted) for it here:
 Popcorn's UEFI loader uses code from Intel's EFI Application toolkit. Relevant
 code includes license statements at the top of each file.
 
-## Waf
-
-Popcorn's build system uses [Waf](https://waf.io/), which claims to be released
-under the BSD license. I could not find its specific license file, so I am
-reproducing a generic 3-clause BSD license (the most restrictive, so as not to
-assume any extra rights that may not actually be granted) for it here:
-
-> Copyright © 2005-2018 Thomas Nagy
-> 
-> Redistribution and use in source and binary forms, with or without
-> modification, are permitted provided that the following conditions are met:
-> 
-> 1. Redistributions of source code must retain the above copyright notice, this
->    list of conditions and the following disclaimer.
-> 
-> 2. Redistributions in binary form must reproduce the above copyright notice,
->    this list of conditions and the following disclaimer in the documentation
->    and/or other materials provided with the distribution.
-> 
-> 3. Neither the name of the copyright holder nor the names of its contributors
->    may be used to endorse or promote products derived from this software
->    without specific prior written permission.
-> 
-> THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-> ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-> WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-> DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-> FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-> DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-> SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-> CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-> OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-> OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
 # Vendored 'external' works
 
 The `external` directory has several libraries' built outputs vendored into it.