CPack: Fix SONAME regex in DEB generator

Merged Kyle Edwards requested to merge kyle.edwards/cmake:cpack-deb-soname into master

The DEB generator was written to parse output from GNU readelf. However, LLVM's readelf has a slightly different output format, without parentheses around the word "SONAME". Update the regex to account for this difference.

Fixes: #19362 (closed)

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