Sprinkle around some library dependencies in dune files

This enables a clean dune build, without any warnings of the form

```
File "_none_", line 1:
Alert ocaml_deprecated_auto_include:
OCaml's lib directory layout changed in 5.0. The unix subdirectory has been
automatically added to the search path, but you should add -I +unix to the
command-line to silence this alert (e.g. by adding unix to the list of
libraries in your dune file, or adding use_unix to your _tags file for
ocamlbuild, or using -package unix for ocamlfind).
```

Author: brk

CodeHawk/CH/chutil/dune

@@ -1,5 +1,5 @@
 (library
   (name chutil)
-  (libraries chlib extlib zarith)
+  (libraries chlib extlib unix zarith)
   (public_name codehawk.chutil)
   (wrapped false))

CodeHawk/CHB/bchanalyze/dune

@@ -1,5 +1,5 @@
 (library
   (name bchanalyze)
-  (libraries bchlib bchlibarm32 bchlibmips32 bchlibpe bchlibpower32 bchlibx86 chlib chutil extlib xprlib)
+  (libraries bchlib bchlibarm32 bchlibmips32 bchlibpe bchlibpower32 bchlibx86 chlib chutil extlib unix xprlib)
   (public_name codehawk.bchanalyze)
   (wrapped false))

CodeHawk/CHB/bchcmdline/dune

@@ -1,6 +1,6 @@
 (executable
   (name bCHXBinaryAnalyzer)
-  (libraries bchanalyze bchcil bchlib bchlibarm32 bchlibelf bchlibmips32 bchlibpe bchlibpower32 bchlibx86 chlib chutil extlib)
+  (libraries bchanalyze bchcil bchlib bchlibarm32 bchlibelf bchlibmips32 bchlibpe bchlibpower32 bchlibx86 chlib chutil extlib unix)
   (modules bCHXBinaryAnalyzer)
   (package exes)
   (public_name chx86_analyze))
@@ -14,35 +14,35 @@
 
 (executable
   (name bCHXSaveExports)
-  (libraries bchlib bchlibpe bchlibx86 chlib chutil)
+  (libraries bchlib bchlibpe bchlibx86 chlib chutil unix)
   (modules bCHXSaveExports)
   (package exes)
   (public_name chx86_save_exports))
 
 (executable
   (name bCHXMakeLibSummary)
-  (libraries bchlib chlib chutil)
+  (libraries bchlib chlib chutil unix)
   (modules bCHXMakeLibSummary)
   (package exes)
   (public_name chx86_make_lib_summary))
 
 (executable
   (name bCHXMakeAppSummary)
-  (libraries bchlib chlib chutil)
+  (libraries bchlib chlib chutil unix)
   (modules bCHXMakeAppSummary)
   (package exes)
   (public_name chx86_make_app_summary))
 
 (executable
   (name bCHXMakeConstSummary)
-  (libraries chlib chutil)
+  (libraries chlib chutil unix)
   (modules bCHXMakeConstSummary)
   (package exes)
   (public_name chx86_make_const_summary))
 
 (executable
   (name bCHXMakeStructDefinition)
-  (libraries chlib chutil)
+  (libraries chlib chutil unix)
   (modules bCHXMakeStructDefinition)
   (package exes)
   (public_name chx86_make_structdef))

CodeHawk/CHB/bchlib/dune

@@ -1,6 +1,6 @@
 (library
   (name bchlib)
-  (libraries chlib chutil extlib xprlib zarith zip)
+  (libraries chlib chutil extlib unix xprlib zarith zip)
   (modules_without_implementation bCHJavaBasicTypes)
   (public_name codehawk.bchlib)
   (wrapped false))

CodeHawk/CHB/bchlibarm32/dune

@@ -1,5 +1,5 @@
 (library
   (name bchlibarm32)
-  (libraries bchlib bchlibelf chlib chutil extlib xprlib)
+  (libraries bchlib bchlibelf chlib chutil extlib str unix xprlib)
   (public_name codehawk.bchlibarm32)
   (wrapped false))

CodeHawk/CHB/bchlibmips32/dune

@@ -1,5 +1,5 @@
 (library
   (name bchlibmips32)
-  (libraries bchlib bchlibelf chlib chutil extlib xprlib)
+  (libraries bchlib bchlibelf chlib chutil extlib str xprlib)
   (public_name codehawk.bchlibmips32)
   (wrapped false))

CodeHawk/CHB/bchlibx86/dune

@@ -1,5 +1,5 @@
 (library
   (name bchlibx86)
-  (libraries bchlib bchlibpe bchlibelf chlib chutil extlib xprlib zarith)
+  (libraries bchlib bchlibpe bchlibelf chlib chutil extlib str unix xprlib zarith)
   (public_name codehawk.bchlibx86)
   (wrapped false))

CodeHawk/CHC/cchanalyze/dune

@@ -1,6 +1,6 @@
 (library
   (name cchanalyze)
-  (libraries cchlib cchpre chlib chutil xprlib zarith)
+  (libraries cchlib cchpre chlib chutil unix xprlib zarith)
   (modules_without_implementation cCHCommon)
   (public_name codehawk.cchanalyze)
   (wrapped false))

CodeHawk/CHC/cchlib/dune

@@ -1,5 +1,5 @@
 (library
   (name cchlib)
-  (libraries chlib chutil extlib xprlib zarith zip)
+  (libraries chlib chutil extlib unix xprlib zarith zip)
   (public_name codehawk.cchlib)
   (wrapped false))

CodeHawk/CHJ/jchcmdline/dune

@@ -28,7 +28,7 @@
 
 (executable
   (name jCHXNativeMethodSignatures)
-  (libraries chlib chutil jchlib jchpre)
+  (libraries chlib chutil jchlib jchpre unix)
   (modules jCHXNativeMethodSignatures)
   (package exes)
   (public_name chj_native))