Include libbinaryninjacore.so symlink in linux package

[smackysnacks]

According to CMake's documentation for the find_library function:

Each library name given to the NAMES option is first considered as a library file name and then considered with platform-specific prefixes (e.g. lib) and suffixes (e.g. .so). Therefore one may specify library file names such as libfoo.a directly. This can be used to locate static libraries on UNIX-like systems.

Including a libbinaryninjacore.so -> libbinaryninjacore.so.1 symlink in the linux release lets us write

find_library(BINJA_CORE_LIBRARY binaryninjacore
    HINTS ${BINJA_BIN_DIR}
)

without resorting to more complicated build logic.

[smackysnacks]

Potential solution using CMake...

find_library(BINJA_CORE_LIBRARY NAMES binaryninjacore "libbinaryninjacore.so.1"
    HINTS ${BINJA_BIN_DIR}
)

This will break if the major number for libbinaryninjacore changes though.

[xusheng6]

Finding the binary ninja core can be done conveniently using the cmake files here: https://github.com/Vector35/binaryninja-api/blob/dev/cmake/FindBinaryNinjaCore.cmake. Also, the version number 1 is unlikely to change, since we are not using it to mark versions.