This patch allows the build process to use the provided dependencies instead
of adding their source as CMake sub-directories (in which case "make install"
would install googletest's and googlebenchmark's libraries and headers).

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57abc26..761c612 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -93,7 +93,7 @@ SET(CONFU_DEPENDENCIES_BINARY_DIR ${CMAKE_BINARY_DIR}/deps
   CACHE PATH "Confu-style dependencies binary directory")
 
 IF(CPUINFO_BUILD_MOCK_TESTS OR CPUINFO_BUILD_UNIT_TESTS)
-  IF(CPUINFO_SUPPORTED_PLATFORM AND NOT DEFINED GOOGLETEST_SOURCE_DIR)
+  IF(FALSE)
     MESSAGE(STATUS "Downloading Google Test to ${CONFU_DEPENDENCIES_SOURCE_DIR}/googletest (define GOOGLETEST_SOURCE_DIR to avoid it)")
     CONFIGURE_FILE(cmake/DownloadGoogleTest.cmake "${CONFU_DEPENDENCIES_BINARY_DIR}/googletest-download/CMakeLists.txt")
     EXECUTE_PROCESS(COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" .
@@ -105,7 +105,7 @@ IF(CPUINFO_BUILD_MOCK_TESTS OR CPUINFO_BUILD_UNIT_TESTS)
 ENDIF()
 
 IF(CPUINFO_BUILD_BENCHMARKS)
-  IF(CPUINFO_SUPPORTED_PLATFORM AND NOT DEFINED GOOGLEBENCHMARK_SOURCE_DIR)
+  IF(FALSE)
     MESSAGE(STATUS "Downloading Google Benchmark to ${CONFU_DEPENDENCIES_SOURCE_DIR}/googlebenchmark (define GOOGLEBENCHMARK_SOURCE_DIR to avoid it)")
     CONFIGURE_FILE(cmake/DownloadGoogleBenchmark.cmake "${CONFU_DEPENDENCIES_BINARY_DIR}/googlebenchmark-download/CMakeLists.txt")
     EXECUTE_PROCESS(COMMAND "${CMAKE_COMMAND}" -G "${CMAKE_GENERATOR}" .
@@ -271,14 +271,6 @@ INSTALL(TARGETS cpuinfo
 
 # ---[ cpuinfo micro-benchmarks
 IF(CPUINFO_SUPPORTED_PLATFORM AND CPUINFO_BUILD_BENCHMARKS)
-  # ---[ Build google benchmark
-  IF(NOT TARGET benchmark)
-    SET(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "")
-    ADD_SUBDIRECTORY(
-      "${GOOGLEBENCHMARK_SOURCE_DIR}"
-      "${CONFU_DEPENDENCIES_BINARY_DIR}/googlebenchmark")
-  ENDIF()
-
   IF(CMAKE_SYSTEM_NAME MATCHES "^(Linux|Android)$")
     ADD_EXECUTABLE(get-current-bench bench/get-current.cc)
     TARGET_LINK_LIBRARIES(get-current-bench cpuinfo benchmark)
@@ -289,7 +281,7 @@ IF(CPUINFO_SUPPORTED_PLATFORM AND CPUINFO_BUILD_BENCHMARKS)
 ENDIF()
 
 IF(CPUINFO_SUPPORTED_PLATFORM)
-  IF(CPUINFO_BUILD_MOCK_TESTS OR CPUINFO_BUILD_UNIT_TESTS)
+  IF(FALSE)
     # ---[ Build google test
     IF(NOT TARGET gtest)
       IF(MSVC AND NOT CPUINFO_RUNTIME_TYPE STREQUAL "static")