cmake : remove obsolete ANDROID check

CMakeLists.txt

@@ -43,12 +43,6 @@ else()
     set(LLAMA_METAL_DEFAULT OFF)
 endif()
 
-if (CMAKE_SYSTEM_NAME MATCHES "ANDROID")
-    set(LLAMA_LLAMAFILE_DEFAULT OFF)
-else()
-    set(LLAMA_LLAMAFILE_DEFAULT ON)
-endif()
-
 # general
 option(BUILD_SHARED_LIBS                "build shared libraries"                                OFF)
 option(LLAMA_STATIC                     "llama: static link libraries"                          OFF)