cmake: prefer pkgconf for finding Linux deps

[pajlada]

Not sure if this really counts as adding a dependency - every development setup I've set up has had either pkgconf or pkg-config preinstalled, so I can revert the readme update if you prefer.

[Adamcake]

Don't you need to change this one too?

Bolt/src/library/CMakeLists.txt

Line 12 in bc80548

target_link_libraries(${BOLT_PLUGIN_LIB_NAME} luajit-5.1)

[pajlada]

Don't you need to change this one too?

Bolt/src/library/CMakeLists.txt

Line 12 in bc80548

target_link_libraries(${BOLT_PLUGIN_LIB_NAME} luajit-5.1)

Good catch, I'll take a look at that too. I was building without libraries when testing

[pajlada]

1a7083c (#166) is unrelated to pkgconf but still related to cmake. It should've been part of the original CEF build but I got lost in my commits.
Let me know if you want me to rebase it away for a separate PR

Additionally, there's one thing still missing for a full out-of-the-box Fedora build, but it's a bit more messy: Fedora system CEF builds with a later version, meaning function method params to OnBeforePopup differ (see chromiumembedded/cef@e513077). My intent is to solve that in a followup PR.

[Adamcake]

CEF versions don't seem to have stable APIs, but the OnBeforePopup thing thankfully happens to be the only breaking change in the last year or two. At some point I will be getting round to updating my own CEF builds to 139 and that issue will be moot, until they break something else.