Update SCons.gitignore (#3001)

prs513rosewood · shiftkey · commit 91cca656dff5 · 2019-03-18T09:14:04.000-03:00
Added some files that SCons generates when its tries to configure libraries.
diff --git a/SCons.gitignore b/SCons.gitignore
@@ -1,2 +1,6 @@
 # for projects that use SCons for building: http://http://www.scons.org/
 .sconsign.dblite
+
+# When configure fails, SCons outputs these
+config.log
+.sconf_temp
