find_package(): Add tests for CMAKE_IGNORE_PATH

Tests/RunCMake/find_package/IgnorePath.cmake

@@ -0,0 +1,12 @@
+set(CMAKE_PREFIX_PATH
+  ${CMAKE_SOURCE_DIR}/PackageRoot/foo/cmake_root
+  ${CMAKE_SOURCE_DIR}/PackageRoot/foo/env_root
+  )
+set(CMAKE_IGNORE_PATH
+  ${CMAKE_SOURCE_DIR}/PackageRoot//foo/cmake_root// # Test double slashes
+  ${CMAKE_SOURCE_DIR}/PackageRoot/foo/env_root/cmake
+  )
+find_package(Bar QUIET CONFIG)
+if(Bar_FOUND)
+  message(FATAL_ERROR "Bar should not be found, was found in ${Bar_DIR}")
+endif()

Tests/RunCMake/find_package/RunCMakeTest.cmake

@@ -44,6 +44,7 @@ run_cmake(VersionRangeConfig2)
 run_cmake(VersionRangeConfig02)
 run_cmake(VersionRangeConfigStd)
 run_cmake(VersionRangeConfigStd2)
+run_cmake(IgnorePath)
 if(UNIX
     AND NOT MSYS # FIXME: This works on CYGWIN but not on MSYS
     )