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

crypto/CMakeLists.txt

@@ -631,6 +631,10 @@ if(NOT HAVE_ARC4RANDOM_BUF)
 	endif()
 endif()
 
+if(NOT HAVE_ARC4RANDOM_UNIFORM)
+	set(CRYPTO_SRC ${CRYPTO_SRC} compat/arc4random_uniform.c)
+endif()
+
 if(NOT HAVE_TIMINGSAFE_BCMP)
 	set(CRYPTO_SRC ${CRYPTO_SRC} compat/timingsafe_bcmp.c)
 endif()