This patch changes the build system to use the JHBuild minimal dependency
system introduced in WebKit r264092 <https://trac.webkit.org/r264092>
The build has been tested with Ubuntu-18.04
The binary size of the zip bundles is now: 37M (WPE) and 40M (GTK).
Previously it was 54M and 59M (respectively)
Second try at #556. Uses absolute paths for the environment variables so that WPEDependencies builds properly. Switches from `WebKitBuildWPE` to `WebKitBuild/WPE` to avoid the need to change the .gitignore.
My computer takes a long time to build, but it appears to be working.
This patch:
- teaches `//browser_patches/webkit/build.sh` to accept the `--wpe` flag
- teaches `//browser_patches/webkit/archive.sh` to accept the `--wpe` flag
- teaches `//browser_patches/webkit/pw_run.sh` to parse the `--headless`
flag. In this case, we will assume that
`//browser_patches/webkit/checkout` is built for WPE and will pass
proper dependencies.
