Missing dependency when building examples

[aslibman]

When running make -j after cmake .. -DCOMPILE_EXAMPLES=YES, I get the following error:

c++: error: /home/vagrant/mbedtls-SGX/example/mbedtls_SGX-2.6.0/libs/libmbedtls_SGX_t.a: No such file or directory
example/enclave/CMakeFiles/enclave.dir/build.make:254: recipe for target 'enclave.so' failed
make[2]: *** [enclave.so] Error 1
CMakeFiles/Makefile2:369: recipe for target 'example/enclave/CMakeFiles/enclave.dir/all' failed
make[1]: *** [example/enclave/CMakeFiles/enclave.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[ 76%] Built target mbedtls_SGX_t
Makefile:127: recipe for target 'all' failed
make: *** [all] Error 2

[bl4ck5un]

Fixed now. If you have better ideas to improve the building of examples, PR is welcome!