Tests/RunCMake/Ninja.*: Sanitize NINJA_STATUS since we expect default behavior

FYI, NINJA_STATUS is "[%f/%t] " by default.

Tests/RunCMake/Ninja/RunCMakeTest.cmake

@@ -18,6 +18,9 @@ else()
   message(FATAL_ERROR "'ninja --version' reported:\n${ninja_out}")
 endif()
 
+# Sanitize NINJA_STATUS since we expect default behavior.
+unset(ENV{NINJA_STATUS})
+
 if(CMAKE_HOST_WIN32)
   run_cmake(SelectCompilerWindows)
 else()

Tests/RunCMake/NinjaMultiConfig/RunCMakeTest.cmake

@@ -5,6 +5,9 @@ include(RunCMake)
 set(RunCMake_GENERATOR "Ninja Multi-Config")
 set(RunCMake_GENERATOR_IS_MULTI_CONFIG 1)
 
+# Sanitize NINJA_STATUS since we expect default behavior.
+unset(ENV{NINJA_STATUS})
+
 function(check_files dir)
   cmake_parse_arguments(_check_files "" "" "INCLUDE;EXCLUDE" ${ARGN})