CMake: Add check.cmake to check for errors in commands

RunCMake uses SEND_ERROR instead of FATAL_ERROR in run_cmake(),
which means that the script will continue to run even if a command
fails.

This change adds a check.cmake file and modifies run_suite_command to
ensure that we exit early if a command fails.

Change-Id: I8175ddc91144e3d0dea131857138af7940626208
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>

tests/manual/RunCMake/InitRepository/check.cmake

@@ -0,0 +1,9 @@
+# This file is include()d by run_cmake right after it calls execute_process.
+# The msg var is set to a non-empty value when the was an error of
+# some kind. Record failure with a separate variable in the parent scope,
+# so we can FATAL_ERROR at the end.
+if(NOT "${msg}" STREQUAL "")
+    set(should_error_out TRUE PARENT_SCOPE)
+else()
+    set(should_error_out FALSE PARENT_SCOPE)
+endif()