modify cmake to build nc

- modify structure of CMakeLists.txt under apps/
  * move apps/CMakeLists.txt to apps/openssl/ since this is for openssl build
  * create new apps/nc/CMakeLists.txt for nc build
  * modify apps/CMakeLists.txt just add_subdirectory()

- add checking and compile of arc4random_uniform()

- add installing man files, openssl.1 and nc.1

include/CMakeLists.txt

@@ -2,4 +2,4 @@ install(DIRECTORY .
         DESTINATION include
         PATTERN "CMakeLists.txt" EXCLUDE
         PATTERN "compat" EXCLUDE
-        PATTERN "Makefile.*" EXCLUDE)
+        PATTERN "Makefile*" EXCLUDE)