build: added a reconfigure target

this is meant to be used by the s3 build, to allow jelmers work on
smbtorture4 in s3 to avoid re-running configure unless its needed

buildtools/scripts/Makefile.waf

@@ -29,6 +29,9 @@ clean:
 distclean:
 	$(WAF) distclean
 
+reconfigure: configure
+	$(WAF) reconfigure
+
 # some compatibility make targets
 everything: all
 

buildtools/wafsamba/samba_utils.py

@@ -507,3 +507,13 @@ def load_file(filename):
     except:
         return None
     return r
+
+
+def reconfigure(ctx):
+    '''rerun configure if necessary'''
+    import Configure, samba_wildcard, Scripting
+    if not os.path.exists(".lock-wscript"):
+        raise Utils.WafError('configure has not been run')
+    bld = samba_wildcard.fake_build_environment()
+    Configure.autoconfig = True
+    Scripting.check_configured(bld)

source4/wscript

@@ -157,3 +157,7 @@ def main():
     wildcard_main(wildcard_cmd)
 Scripting.main = main
 
+def reconfigure(ctx):
+    '''reconfigure if config scripts have changed'''
+    import samba_utils
+    samba_utils.reconfigure(ctx)