Workaround build failure for range-v3 example code

Summary:
X-link: facebookincubator/zstrong#1051

In `range-v3`, the calendar example app fails to build. This was not detected when building range-v3 itself because the calendar app is only added as a buildable executable when `boost` is available ([code](https://github.com/ericniebler/range-v3/blob/master/example/CMakeLists.txt#L32)), but `boost` is not marked as a required dependency of `range-v3` in the manifest ([code](https://www.internalfb.com/code/fbsource/fbcode/opensource/fbcode_builder/manifests/range-v3)).

During FBOSS OSS builds however, `boost` is pulled in as an indirect dependency, so the build will fail: P1677307273

This change omits building the example code.

Reviewed By: harshitgulati18

Differential Revision: D65774962

fbshipit-source-id: 7f9f1238f08d6785981a53ae669989b95c63fa43

build/fbcode_builder/manifests/range-v3

@@ -9,3 +9,6 @@ sha256 = 376376615dbba43d3bef75aa590931431ecb49eb36d07bb726a19f680c75e20c
 [build]
 builder = cmake
 subdir = range-v3-0.11.0
+
+[cmake.defines]
+RANGE_V3_EXAMPLES=OFF