Use ccache for packages built with cmake. * Makefile.in: New variable CMAKE_CCACHE_FLAGS. * src/armadillo.mk, src/cgal.mk, src/cmake.mk, src/cminpack, src/double-conversion.mk, src/eigen.mk, src/gdcm.mk, src/gl2ps.mk, src/hdf5.mk, src/lapack.mk, src/libical.mk, src/libproxy, src/llvm.mk, src/of-dicom.mk, src/openal.mk, src/opencv.mk, src/openexr.mk, src/openscenegraph.mk, src/physfs.mk, src/qhull.mk, src/qjson.mk, src/rapidjson.mk, src/suitesparse.mk, src/sundials-ida.mk, src/taglib.mk, src/vigra.mk, src/vmime.mk, src/vtk.mk, src/wt.mk: Add new variable to cmake flags. Harmonize indentation in files.

--- a/src/qjson.mk	Sat Sep 19 17:35:15 2020 +0200
+++ b/src/qjson.mk	Sun Sep 20 11:57:01 2020 +0200
@@ -20,6 +20,7 @@
     echo '$(MXE_QMAKE)'
     mkdir '$(1)/build'
     cd '$(1)/build' && cmake .. \
+        $(CMAKE_CCACHE_FLAGS) \
         -DCMAKE_TOOLCHAIN_FILE='$(CMAKE_TOOLCHAIN_FILE)' \
         -DLIBTYPE=STATIC