drop the wchar.h/wctype.h/stdarg.h checks

Since gnulib provides these now, we can assume them.

autogen.sh

@@ -12,10 +12,13 @@ modules="
 	iswblank
 	regex
 	snprintf-posix
+	stdarg
 	strcase
 	strcasestr-simple
 	strnlen
 	vsnprintf-posix
+	wchar
+	wctype-h
 "
 
 # Make sure the local gnulib git repo is up-to-date.

configure.ac

@@ -57,7 +57,7 @@ AC_DEFINE_DIR([PKGDATADIR], [pkgdatadir], [Where data are placed to.])
 
 dnl Checks for header files.
 
-AC_CHECK_HEADERS(libintl.h limits.h sys/param.h wchar.h wctype.h stdarg.h)
+AC_CHECK_HEADERS(libintl.h limits.h sys/param.h)
 
 dnl Checks for options.
 

src/chars.c

@@ -26,12 +26,8 @@
 #include <ctype.h>
 
 #ifdef ENABLE_UTF8
-#ifdef HAVE_WCHAR_H
 #include <wchar.h>
-#endif
-#ifdef HAVE_WCTYPE_H
 #include <wctype.h>
-#endif
 
 static bool use_utf8 = FALSE;
 	/* Whether we've enabled UTF-8 support. */

src/nano.h

@@ -49,9 +49,7 @@
 #include <sys/param.h>
 #endif
 
-#ifdef HAVE_STDARG_H
 #include <stdarg.h>
-#endif
 
 /* Suppress warnings for __attribute__((warn_unused_result)). */
 #define IGNORE_CALL_RESULT(call) do { if (call) {} } while(0)