[CMake] using fetch_content imported modules and not system one

[Stéphane Ancelot]

hi,

i used fetch_content to download bullet library , but I cant use it.

FetchContent_Declare(
   bullet
   GIT_REPOSITORY https://github.com/bulletphysics/bullet3.git
   GIT_TAG        2.88

)

FetchContent_GetProperties(bullet)
if(NOT bullet_POPULATED)
   FetchContent_Populate(bullet)
   add_subdirectory(${bullet_SOURCE_DIR} ${bullet_BINARY_DIR})
endif()

linking using bullet does not permit to find any include or lib file

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