CMake build infrastructure II (#53)

* CMake build infrastructure

The squashed commit that builds and packages releases for the SIMH
simulator suite with CMake, version 3.14 or newer.

See README-CMake.md for documentation.

sigma/CMakeLists.txt

@@ -0,0 +1,38 @@
+## sigma simulator
+##
+## This is an automagically generated file. Do NOT EDIT.
+## Any changes you make will be overwritten!!
+##
+## Make changes to the SIMH top-level makefile and then run the
+## "cmake/generate.py" script to regenerate these files.
+##
+##     cd cmake; python -m generate --help
+##
+## ------------------------------------------------------------
+
+if (HAVE_UNITY_FRAMEWORK AND EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/unit-tests/CMakeLists.txt")
+  add_subdirectory(unit-tests)
+endif ()
+
+add_simulator(sigma
+    SOURCES
+        sigma_cpu.c
+        sigma_sys.c
+        sigma_cis.c
+        sigma_coc.c
+        sigma_dk.c
+        sigma_dp.c
+        sigma_fp.c
+        sigma_io.c
+        sigma_lp.c
+        sigma_map.c
+        sigma_mt.c
+        sigma_pt.c
+        sigma_rad.c
+        sigma_rtc.c
+        sigma_tt.c
+    INCLUDES
+        ${CMAKE_CURRENT_SOURCE_DIR}
+    LABEL sigma
+    PKG_FAMILY sds_family
+    TEST sigma)