Minor fix in CMake configuration

Move INCLUDE(GNUInstallDirs) below PROJECT declaration to fix CMake warning.

PiperOrigin-RevId: 306264403
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b4b7a27..70ff9b5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,8 +8,6 @@
 
 CMAKE_MINIMUM_REQUIRED(VERSION 3.5 FATAL_ERROR)
 
-INCLUDE(GNUInstallDirs)
-
 # ---[ Project and semantic versioning.
 PROJECT(XNNPACK C CXX ASM)
 
@@ -21,6 +19,8 @@
 OPTION(XNNPACK_BUILD_BENCHMARKS "Build XNNPACK benchmarks" ON)
 
 # ---[ CMake options
+INCLUDE(GNUInstallDirs)
+
 IF(XNNPACK_BUILD_TESTS)
   ENABLE_TESTING()
 ENDIF()