Add multiple requirements for toolset subconditions instead of one composite as they are not supported for conditional requirements. Thanks to Roland for finding the problem.

[SVN r44354]

tools/build

@@ -1 +1 @@
-Subproject commit df5a46c2a9c540538e25e3a1f8d8f19c069b6052
+Subproject commit 7ec865e5bc761bfa9af6bbbfaf6762100fd8785f