cmake: build with -D__NO_MATH_INLINES

To use the new clang-based AspectC++ (ac++ >1.2), Fail* must be built
with -D__NO_MATH_INLINES (or --c_compiler clang++).

Change-Id: I020d62891946d09ac456b8df914b669ab33ab0e2

doc/how-to-build.txt

@@ -19,6 +19,8 @@ Required for Fail*:
    obtained from <http://www.aspectc.org>; nightlies can be downloaded from
    <http://akut.aspectc.org>.  Make sure you use the 64-bit version if running
    in a 64-bit environment.
+   * AspectC++ >1.2 (clang-based AspectC++): build with CMAKE_AGPP_FLAGS
+     "-D__NO_MATH_INLINES" or "--c_compiler clang++"
  - optional:
    * LLVM 3.3 or 3.4 (needed for several importers in tools/import-trace)
      (compiles/links with 3.1 or 3.2, but fails to properly import information