Source the helpers script after changing to project root directory.

So that the main script can be invoked from anywhere.

cmake_gcc.sh

@@ -20,13 +20,13 @@
 # THE SOFTWARE.
 #
 
-# Define helpers
-. .bash_helpers
-
 # Ensure we are in project root directory
 cd $( dirname $0 )
 SOURCE=`pwd`/Source
 
+# Define helpers
+. .bash_helpers
+
 # Create out-of-source build directory
 cmake -E make_directory Build
 [ $RASPI_TOOL ] && cmake -E make_directory raspi-Build