eclipse: add possibility to add custom targets execution

Make it easy to add custom target executions in the automatic
eclipse configuration generation, for example to call other
standard waf targets from other tools or with specific options.

playground/eclipse/wscript

@@ -54,6 +54,7 @@ def options(opt):
 
 
 def configure(conf):
+	conf.env.ECLIPSE_EXTRA_TARGETS = ['test', 'lint', 'foo --bar']
 	conf.load('eclipse')
 	# We recurse configurations in our submodules
 	conf.recurse(module_list)

waflib/extras/eclipse.py

@@ -10,6 +10,9 @@ Usage:
 def options(opt):
 	opt.load('eclipse')
 
+To add additional targets beside standard ones (configure, dist, install, check)
+the environment ECLIPSE_EXTRA_TARGETS can be set (ie. to ['test', 'lint', 'docs'])
+
 $ waf configure eclipse
 """
 
@@ -400,6 +403,8 @@ class eclipse(Build.BuildContext):
 		addTargetWrap('dist', False)
 		addTargetWrap('install', False)
 		addTargetWrap('check', False)
+		for addTgt in getattr(self.env, 'ECLIPSE_EXTRA_TARGETS', []):
+			addTargetWrap(addTgt, False)
 
 		storageModule = self.add(doc, cproject, 'storageModule',
 							{'moduleId': 'cdtBuildSystem',