Enable /bigobj globally on MSVC.

This changes the intermediate format used for compiled files from one
that can hold up to 65279 (slightly less than 2^16) addressable sections
to one that can hold 4294967296 (2^32).

Code that uses templates, such as... C++ code... can easily run up
against the smaller limit. This does not affect the finished executable,
only the intermediate object files.

CMakeLists.txt

@@ -89,6 +89,10 @@ if(MSVC)
     # a smaller type, and most of the time this is just conversion from 64 to 32 bits
     # for things like vector sizes, which are never that big anyway.
     add_definitions("/wd4267")
+
+    # MSVC panics if an object file contains more than 65,279 sections. this
+    # happens quite frequently with code that uses templates, such as vectors.
+    add_definitions("/bigobj")
 endif()
 
 # Automatically detect architecture based on Visual Studio generator