Ignore failure when deleting something that might not exist

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2002 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/makelib.b32

@@ -15,7 +15,7 @@ WXDIR = $(WXWIN)
 !include $(WXDIR)\src\makeb32.env
 
 $(LIBTARGET): $(OBJECTS)
-        erase $(LIBTARGET)
+        -erase $(LIBTARGET)
 	tlib $(LIBTARGET) /P512 @&&!
 -+$(OBJECTS:.obj =.obj -+)
 !

src/msw/makefile.b32

@@ -265,7 +265,7 @@ all:	all_libs all_execs
 !if "$(DLL)" == "0"
 
 $(LIBTARGET): $(DUMMY).obj $(OBJECTS)
-        erase $(LIBTARGET)
+        -erase $(LIBTARGET)
 	tlib $(LIBTARGET) /P512 @&&!
 -+$(OBJECTS:.obj =.obj -+) -+$(PERIPH_LIBS:.lib =.lib -+)
 !
@@ -273,8 +273,8 @@ $(LIBTARGET): $(DUMMY).obj $(OBJECTS)
 !else
 
 $(LIBTARGET): $(DUMMY).obj $(OBJECTS)
-	erase $(LIBTARGET)
-	erase $(WXLIBDIR)\wx.dll
+	-erase $(LIBTARGET)
+	-erase $(WXLIBDIR)\wx.dll
         tlink32 $(LINK_FLAGS) /v @&&!
 c0d32.obj $(OBJECTS)
 $(WXLIBDIR)\wx
@@ -716,13 +716,13 @@ $(WIN95FLAG)
 # -Oxt
 
 clean: $(PERIPH_CLEAN_TARGET)
-    erase $(LIBTARGET)
-    erase *.obj
-    erase *.pch
-    erase *.csm
-    erase *.cfg
-	erase ..\common\y_tab.c
-    erase ..\common\lex_yy.c
+    -erase $(LIBTARGET)
+    -erase *.obj
+    -erase *.pch
+    -erase *.csm
+    -erase *.cfg
+	-erase ..\common\y_tab.c
+    -erase ..\common\lex_yy.c
 
 cleanall: clean
 

src/png/makefile.b32

@@ -36,7 +36,7 @@ OBJECTS = png.obj pngread.obj pngrtran.obj pngrutil.obj \
 all: $(WINPNGLIB)
 
 $(WINPNGLIB): $(OBJECTS) 
-        erase $(WINPNGLIB)
+        -erase $(WINPNGLIB)
 	tlib $(WINPNGLIB) /P512 @&&!
 -+$(OBJECTS:.obj =.obj -+) 
 !