Prompt to install missing system dependencies

[asgrim]

If a package requires some missing system dependencies, by default PIE should prompt to see if we want to attempt to install the system dep with apt/yum/apk, etc. depending on the system. If we can't detect how to install the dependency, or we are running non-interactively, just let the Composer resolution fail (which will highlight that the system dep is missing).

Any dev deps installed by PIE should be subsequently removed (unless they existed beforehand). For example; ext-foo depends on lib-foo which is missing, so we install libfoo and libfoo-dev; after installing the ext, we remove libfoo-dev but not libfoo. However, if either or both of these were already installed before PIE runs, we should not remove them.

However, this chekcing behaviour should be disabled with a flag, if provided, as some people may not want it.

[tillkruss]

We deal with dependencies across distros and for example hiredis is referred to as hiredis on EL/CentOS but on Debian it's libhiredis, however the actual version requirement of our package is libhiredis1.1.0 >= 1.1.0.

[remicollet]

after installing the ext, we remove libfoo-dev but not libfoo.

This probably won't work, as the devel package may require a lot of other packages, so its removal won't left the system unchanged.

We deal with dependencies across distros and for example hiredis is referred to as hiredis on EL/CentOS but on Debian it's libhiredis, however the actual version requirement of our package is libhiredis1.1.0 >= 1.1.0

On RPM distro, don't need to know the package name.

If the config.m4 uses PKG_CHECK_MODULES(foo) you have to install pkgconfig(foo)

# dnf install 'pkgconfig(hiredis)'
Package "hiredis-devel-1.2.0-3.fc41.x86_64" is already installed.
Nothing to do.