more AC_CHECK_HEADERS fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47597 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -2560,7 +2560,7 @@ WIDGET_SET=
 dnl are we building for a win32 target environment?
 dnl If so, setup common stuff needed for both GUI and Base libs.
 if test "$USE_WIN32" = 1 ; then
-    AC_CHECK_HEADER(w32api.h,,, [ ])
+    AC_CHECK_HEADERS(w32api.h,,, [ ])
     AC_CHECK_HEADER(windows.h,,
     [
         AC_MSG_ERROR(please set CFLAGS to contain the location of windows.h)
@@ -4303,7 +4303,7 @@ if test "$wxUSE_UNICODE" = yes; then
 #include <wchar.h>"
     case "${host}" in
         *-*-solaris2* )
-            AC_CHECK_HEADER(widec.h,,, [AC_INCLUDES_DEFAULT()])
+            AC_CHECK_HEADERS(widec.h,,, [AC_INCLUDES_DEFAULT()])
             if test "$ac_cv_header_widec_h" = "yes"; then
                 wchar_headers="$wchar_headers
 #include <widec.h>"