Add CPPFLAGS to CMake explicitly

Even though CMake is supplied with (via `base/cmake_package.py`)

-DCMAKE_PREFIX_PATH="${BOOST_DIR};${BZIP2_DIR};..."

For some reason, some of the `-I` statements do not get propagated to g++. If
we add the line

-DCMAKE_CXX_FLAGS:STRING="${CPPFLAGS}"

Then all the necessary `-I` statements are propagated. Note the quotation marks
around "${CPPFLAGS}$, those are necessary, since there are spaces in the
variable.

Author: certik

pkgs/cmb.yaml

@@ -20,5 +20,6 @@ build_stages:
           '-DKML_DIR:PATH=${KML_DIR}',
           '-DGDAL_DIR:PATH=${GDAL_DIR}',
           '-DParaView_DIR:PATH=${PARAVIEW_DIR}',
-          '-DMoleQueue_DIR:PATH=${MOLEQUEUE_DIR}'
+          '-DMoleQueue_DIR:PATH=${MOLEQUEUE_DIR}',
+          '-DCMAKE_CXX_FLAGS:STRING="${CPPFLAGS}"',
           ]