Fix scons leaving partially generated files when aborting

SConstruct

@@ -627,6 +627,7 @@ def data_to_c(FILE_FROM, FILE_TO, VAR_NAME):
         FILE_FROM = FILE_FROM.replace("/", "\\")
         FILE_TO   = FILE_TO.replace("/", "\\")
 
+    try:
         # first check if we need to bother.
         if os.path.exists(FILE_TO):
             if os.path.getmtime(FILE_FROM) < os.path.getmtime(FILE_TO):
@@ -652,6 +653,10 @@ def data_to_c(FILE_FROM, FILE_TO, VAR_NAME):
 
         fpin.close()
         fpout.close()
+    except KeyboardInterrupt:
+        if os.path.exists(FILE_TO):
+            os.remove(FILE_TO)
+        raise KeyboardInterrupt
 
 def data_to_c_simple(FILE_FROM):
 	filename_only = os.path.basename(FILE_FROM)
@@ -676,7 +681,12 @@ def data_to_c_simple_icon(PATH_FROM):
     FILE_TO_PNG = os.path.join(env['DATA_SOURCES'], filename_only + ".png")
     FILE_TO = FILE_TO_PNG + ".c"
     argv = [PATH_FROM, FILE_TO_PNG]
+    try:
         datatoc_icon.main_ex(argv)
+    except KeyboardInterrupt:
+        if os.path.exists(FILE_TO_PNG):
+            os.remove(FILE_TO_PNG)
+        raise KeyboardInterrupt
 
     # then the png to a c file
     data_to_c_simple(FILE_TO_PNG)