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/armadillo.mk	Sat Sep 19 17:35:15 2020 +0200
+++ b/src/armadillo.mk	Sun Sep 20 11:57:01 2020 +0200
@@ -18,7 +18,9 @@
 endef
 
 define $(PKG)_BUILD
-    cd '$(1)' && cmake . -DCMAKE_TOOLCHAIN_FILE='$(CMAKE_TOOLCHAIN_FILE)'
+    cd '$(1)' && cmake . \
+        $(CMAKE_CCACHE_FLAGS) \
+        -DCMAKE_TOOLCHAIN_FILE='$(CMAKE_TOOLCHAIN_FILE)'
     $(MAKE) -C '$(1)' -j '$(JOBS)' install VERBOSE=1
 
     # note: don't use -Werror with GCC 4.7.0 and .1