[vcpkg] Add a definition for OVERLAY_TRIPLET_ENV
This definition is needed in C++14/gcc 6 to compile.
MODIFY
src/vcpkg/vcpkgcmdarguments.cpp
src/vcpkg/vcpkgcmdarguments.cpp
@@ -912,6 +912,7 @@ namespace vcpkg
constexpr StringLiteral VcpkgCmdArguments::OVERLAY_PORTS_ENV;
constexpr StringLiteral VcpkgCmdArguments::OVERLAY_PORTS_ARG;
constexpr StringLiteral VcpkgCmdArguments::OVERLAY_TRIPLETS_ARG;
+ constexpr StringLiteral VcpkgCmdArguments::OVERLAY_TRIPLETS_ENV;
constexpr StringLiteral VcpkgCmdArguments::BINARY_SOURCES_ARG;

[vcpkg] Add a definition for OVERLAY_TRIPLET_ENV (#14436)

This definition is needed in C++14/gcc 6 to compile.