SagePatch: pin target to C++17 so macOS builds

[mohamedelabbas1996]

Problem

Building sage_patch on macOS fails with:

error: scoped enumerations are a C++11 extension [-Wc++11-extensions]
error: expected ';' at end of declaration    (SDL_Rect bounds{};)

The sage_patch sources use modern C++ (scoped enums, brace-init), but the target sets no C++ standard, so it inherits the engine's global C++98. A standards-strict compiler (AppleClang) then rejects the C++11/17 constructs and the macOS build breaks.

Fix

Pin the sage_patch target to C++17 (independent of the legacy engine's standard):

set_target_properties(sage_patch PROPERTIES
    CXX_STANDARD 17
    CXX_STANDARD_REQUIRED ON
)

One-line behavior change, scoped to the sage_patch target only. Verified: the macOS z_generals build links cleanly with this in place.

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