Canonicalize the library path returned by dladdr

On systems using UsrMerge (like openSUSE or Fedora), /lib64 is a symlink to /usr/lib64. So dladdr is returning the path to the gstreamer library in /lib64 in priv_gst_get_relocated_libgstreamer. Later gst_plugin_loader_spawn tries to build the path to the gst-plugin-scanner helper from /lib64 and ends up trying to use /lib64/../libexec/gstreamer-1.0/gst-plugin-scanner which doesn't exist.

By canonicalizing the path with a call to realpath, gst-plugin-scanner is found correctly under /usr/lib64/../libexec/gstreamer-1.0/gst-plugin-scanner

Fixes: #2877 (closed)

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added 1.24 Needs backport Regression labels

mentioned in issue #3352 (closed)

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• 205ae757 - Use pathconf to avoid using PATH_MAX
• 6a651fab - Canonicalize the library path returned by dladdr

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• 642589af - Obtain path_max in a standard way, fix indent and use g_free

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Looks good to me except for those minor things. Can you fix and then squash it all into a single commit?

Thanks!

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• 8d17e447 - Canonicalize the library path returned by dladdr

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