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.

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Insist that ssize_t is defined.

diff --git a/util/cairo-missing/cairo-missing.h b/util/cairo-missing/cairo-missing.h
index 7e4f0a3..c20b869 100644
--- a/util/cairo-missing/cairo-missing.h
+++ b/util/cairo-missing/cairo-missing.h
@@ -37,6 +37,8 @@
 #include <string.h>
 #include <sys/types.h>
 
+#define _SSIZE_T_DEFINED 1
+
 #ifdef _WIN32
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>