euclide does not support parallel build

[Pim Vullers]

Euclide's build fails due to missing dependency information. Although

target_link_libraries(euclide euclidecore)

implies some dependency it seems not to be explicit enough for CMake. Therefor the attached patch adds some explicit dependencies using

add_dependencies()

(To try it out yourself build using make -j3 or -j5.)

[Pim Vullers (pimvullers)]

The attached patch fixes the build issues on my system by introducing the required dependencies between the different components.

[Mario Guerriero (mefrio-g)]

it does not work with your patch.