Update Cmake Install Path

[rjbrown2]

          Just caught this; I reccomend changing line 132 from `set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/cpu${TGTSYS_${SYSVAR}}/${INSTALL_SUBDIR}")` to `set(CMAKE_INSTALL_RPATH "./${INSTALL_SUBDIR}")`

Originally posted by @williamposey in #276 (comment)

[rjbrown2]

williamposey 11 hours ago •
If I can sneak in another change, it would be helpful to add install(TARGETS crypto RUNTIME_DEPENDENCIES DESTINATION ${CMAKE_INSTALL_PREFIX}/${TGTSYS_${SYSVAR}}/${INSTALL_SUBDIR}) right after add_cfe_app(crypto ${LIB_SRC_FILES}).

This, along with the change mentioned above to set(CMAKE_INSTALL_RPATH "./${INSTALL_SUBDIR}") would allow for any dependencies, like wolfssl, to be installed into the cf/ folder alongside cryptolib, and set the runtime search path to the cf/ folder to find it, for cFS integration.

If this can't make it into this PR then no problem and I can move it to another issue; let me know! Thanks