add headers to the samples' bakefiles so that they show up in MSVC project files

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59311 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/stc/stctest.bkl

@@ -6,24 +6,29 @@
     <exe id="stctest" template="wx_sample" template_append="wx_append">
         <sources>
             stctest.cpp
-	    edit.cpp
-	    prefs.cpp
+            edit.cpp
+            prefs.cpp
         </sources>
+        <headers>
+            edit.h
+            defsext.h
+            prefs.h
+        </headers>
         <wx-lib>stc</wx-lib>
         <wx-lib>core</wx-lib>
         <wx-lib>base</wx-lib>
-        
+
         <if cond="OUT_OF_TREE_MAKEFILES=='0'">
             <sys-lib>$(LIB_SCINTILLA)</sys-lib>
         </if>
-        
+
         <win32-res>../sample.rc</win32-res>
     </exe>
 
-    <wx-data id="data">   
-        <files>   
-             stctest.cpp   
-        </files>   
-    </wx-data>   
-  
+    <wx-data id="data">
+        <files>
+             stctest.cpp
+        </files>
+    </wx-data>
+
 </makefile>