Speed-up detection of installed externals in RPM-based distros #1036
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Although the yum/dnf wrappers are needed for the installation proper, we can
speed up detections of already installed packages by using rpm directly.
Unfortunately, rpm cannot give info on not installed packages, but this still
should speed up things greatly for the usual case of gnat/gprbuild being installed.
Fixes #1028
@BeChris, as you did the original implementation, would you be so kind to check if you see any obvious problem with these changes?