project: Do not issue CMP0048 warnings on injected call

Brad Kingrequested to merge
brad.king/cmake:project-injected-no-cmp0048 into master

The project(Project) call injected by CMake when no project() call appears explicitly in the top-level CMakeLists.txt file is generated so there is no point in warning on it.

Fixes: #18202 (closed)

Edited by Brad King

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