cast integral constant expression to bool to fix some compiler warnings and some compiler bugs.

[SVN r10230]

libs/static_assert

@@ -1 +1 @@
-Subproject commit 8b37ed2072c5010ee13051e4be32ac3d74bc239c
+Subproject commit 2b67e5a18292fd1a2570ff9b5302a1173b160a54