update INSTALL.md for c++14 requirement

clang 3.8 is needed for "Money, Time, and hexfloat I/O manipulators (N2071)" (a c++11 feature)
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@ -10,8 +10,8 @@ Contents
## 1. Prerequisites
Wesnoth requires a compiler with sufficient C++11 support such as GCC 4.8 and
later, or Clang 3.3 and later.
Wesnoth requires a compiler with sufficient C++14 support such as GCC 5.0 and
later, or Clang 3.8 and later.
You'll need to have these libraries and their development headers installed in
order to build Wesnoth: