Fix CMakeLists.txt for the use as a subdirectory in another project #103
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Replaced
${CMAKE_SOURCE_DIR}
with${CMAKE_CURRENT_SOURCE_DIR}
.This eliminates the assumption that crow's source directory is the source root and therefore fixes the building process when crow is built in a subdirectory of another project where this assumption does not hold.
I've tested the change on Linux and it does not seem to break anything.