Rework how arguments are parsed and tested to fix handling of quoted arguments, options arguments, and arguments with "=". (fixes #2113)

[SVN r49905]

tools/build

@@ -1 +1 @@
-Subproject commit 3d73010ad9278b93c0b7fa537bc91d41cd9b9ebd
+Subproject commit 588958fc06703584d167a46ac1757c9f67dc6196