enhanced --enable-unicode to accept ucs4 and ucs2 in addition to yes/no.

redefined the moo_uch_t type to follow the enable-unicode value

moo/configure

@@ -1504,7 +1504,8 @@ Optional Features:
   --enable-ltdl-install   install libltdl
   --enable-debug          build the library in the debug mode (default. no)
   --enable-unicode        Use the unicode character type as the default
-                          character type (default. yes)
+                          character type. one of yes, no, ucs2, ucs4 (default.
+                          yes)
   --enable-cxx            build the library for C++ if a C++ compiler is
                           available (default. yes)
   --enable-dynamic-module enable dynamic module capability(default. yes)
@@ -22521,7 +22522,6 @@ $as_echo "#define MOO_BUILD_RELEASE 1" >>confdefs.h
 
 fi
 
-
 # Check whether --enable-unicode was given.
 if test "${enable_unicode+set}" = set; then :
   enableval=$enable_unicode; enable_unicode=$enableval
@@ -22535,6 +22535,16 @@ then
 
 $as_echo "#define MOO_ENABLE_UNICODE 1" >>confdefs.h
 
+elif test "${enable_unicode}" = "ucs2"
+then
+
+$as_echo "#define MOO_ENABLE_UNICODE 2" >>confdefs.h
+
+elif test "${enable_unicode}" = "ucs4"
+then
+
+$as_echo "#define MOO_ENABLE_UNICODE 4" >>confdefs.h
+
 fi
 
 # Check whether --enable-cxx was given.