Populate fcl.pc with the correct installation paths.

[mband]

On my Ubuntu 14.04 with CMake 2.8.12 I found the following issue with fcl.pc:

# This file was generated by CMake for fcl
prefix=/some/path/projects/fcl_implementation/install_target
exec_prefix=${prefix}
libdir=/some/path/projects/fcl_implementation/install_target/lib
includedir=/some/path/projects/fcl_implementation/install_target/include

But the library got placed in /some/path/projects/fcl_implementation/install_target/lib/x86_64-linux-gnuand NOT in /some/path/projects/fcl_implementation/install_target/lib as specified.

This PR fixes this issue in a similar way as to how it is done in https://github.com/danfis/libccd/blob/master/ccd.pc.in

[mband]

Is there a proper way to trigger a rerun of the Travis CI build? As it failed due to not being able to download the Ubuntu packages...

[jslee02]

Without additional commit, it can be triggered by someone has authority. I reran the failed Travis CI builds.

[scpeters]

Two builds had spurious failures, and I just re-triggered them.

[scpeters]

travis is fixed. +1

[sherm1]

👍 - merge?