CMake: Bugfix: Strip input variables for CHECK_COMPILER_SETUP
CMake: Bugfix: Strip input variables for CHECK_COMPILER_SETUP

CMake 2.8.8 (and possibly till 2.8.11) do not normalize
CMAKE_REQUIRED_FLAGS and CMAKE_REQUIRED_LIBRARIES correctly leading to
stray "-l " in the linker command line.

Fix this by normalizing the input of CHECK_COMPILER_SETUP by stripping
leading and trailing whitespace

kalj/dealii,sairajat/dealii,EGP-CIG-REU/dealii,sairajat/dealii,spco/dealii,EGP-CIG-REU/dealii,angelrca/dealii,spco/dealii,naliboff/dealii,shakirbsm/dealii,danshapero/dealii,EGP-CIG-REU/dealii,JaeryunYim/dealii,danshapero/dealii,jperryhouts/dealii,angelrca/dealii,danshapero/dealii,spco/dealii,naliboff/dealii,sairajat/dealii,shakirbsm/dealii,JaeryunYim/dealii,EGP-CIG-REU/dealii,pesser/dealii,jperryhouts/dealii,naliboff/dealii,shakirbsm/dealii,naliboff/dealii,angelrca/dealii,shakirbsm/dealii,naliboff/dealii,pesser/dealii,sairajat/dealii,jperryhouts/dealii,angelrca/dealii,spco/dealii,pesser/dealii,spco/dealii,kalj/dealii,JaeryunYim/dealii,kalj/dealii,angelrca/dealii,spco/dealii,pesser/dealii,sairajat/dealii,jperryhouts/dealii,JaeryunYim/dealii,jperryhouts/dealii,naliboff/dealii,danshapero/dealii,danshapero/dealii,kalj/dealii,kalj/dealii,sairajat/dealii,angelrca/dealii,pesser/dealii,EGP-CIG-REU/dealii,shakirbsm/dealii,kalj/dealii,EGP-CIG-REU/dealii,EGP-CIG-REU/dealii,sairajat/dealii,kalj/dealii,shakirbsm/dealii,jperryhouts/dealii,angelrca/dealii,JaeryunYim/dealii,JaeryunYim/dealii,pesser/dealii,danshapero/dealii,shakirbsm/dealii,danshapero/dealii,naliboff/dealii,JaeryunYim/dealii,jperryhouts/dealii,spco/dealii,pesser/dealii