Add .so libs for libbacktrace

[K1ngfish3r]

The following adds

/usr/lib64/libbacktrace.so
/usr/lib64/pkgconfig/libbacktrace.pc

Autospec notes for the package libbacktrace - for-review.txt

series 0001-Provide-project-information-to-autotools.patch 0002-Add-pkg-config-file.patch

build_pattern = configure_ac configure = --enable-shared