[CMake] Building third party library as part of CMake project

[Truman Ellis]

I have a top level CMakeLists.txt file which builds a library called 
Camellia and several executables in subdirectories which link with 
Camellia. I would like to add a third party library called XDMF as a 
dependency for Camellia under Camellia/TPL/Xdmf. Luckily, XDMF is 
already on a CMake build system, but when I use

add_subdirectory(TPL/Xdmf)

and then

add_library(Camellia ${LIB_SOURCES} ${HEADERS})

it builds Camellia in the build/TPL/Xdmf/bin directory rather than build 
as it does without the add_subdirectory(TPL/Xdmf). Why does adding a 
subdirectory change the build directory for Camellia, and how do I fix 
it? Also how do I make sure Camellia is linking with Xdmf once I get 
that figured out?
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