REGEX is wrong for readelf used by cpack DEB generator
The following code is used to get the soversion.
string(REGEX MATCH "\\(SONAME\\)[^\n]*\\[([^\n]+)\\.so\\.([^\n]*)\\]" soname "${output}")However this relies on gcc's readelf.
LLVM has a slightly different version that doesn't have () around SONAME.
LLVM:
0x000000000000000e SONAME Library soname: [libxxxxxx.so.3]
GCC:
0x000000000000000e (SONAME) Library soname: [libxxxxxx.so.3]
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