Tests: switch off some RunCMake tests for broken libc on e2k

Some old OS Elbrus installations (e.g. 6.0.1) have libc that
tends to behave incorrectly in some rare cases. This prevents
some tests from being run correctly:
- RunCMake.Graphviz, test no_module_libs
- RunCMake.Syntax, test EscapeCharsDisallowed
These tests are now not run in case of such libc.

Tests/RunCMake/CMakeLists.txt

@@ -21,6 +21,9 @@ macro(add_RunCMake_test test)
   if(CMAKE_C_COMPILER_ID STREQUAL "LCC")
     list(APPEND TEST_ARGS -DRunCMake_TEST_LCC=1)
   endif()
+  if(DEFINED CMake_TEST_E2K_BROKEN_LIBC)
+    list(APPEND TEST_ARGS -DRunCMake_TEST_E2K_BROKEN_LIBC=${CMake_TEST_E2K_BROKEN_LIBC})
+  endif()
   add_test(NAME RunCMake.${test} COMMAND ${CMAKE_CMAKE_COMMAND}
     -DCMAKE_MODULE_PATH=${CMAKE_CURRENT_SOURCE_DIR}
     -DRunCMake_GENERATOR_IS_MULTI_CONFIG=${_isMultiConfig}

Tests/RunCMake/Graphviz/RunCMakeTest.cmake

@@ -66,7 +66,9 @@ run_test(no_executables GRAPHVIZ_EXECUTABLES FALSE)
 
 run_test(no_static_libs GRAPHVIZ_STATIC_LIBS FALSE)
 run_test(no_shared_libs GRAPHVIZ_SHARED_LIBS FALSE)
-run_test(no_module_libs GRAPHVIZ_MODULE_LIBS FALSE)
+if(NOT RunCMake_TEST_E2K_BROKEN_LIBC)
+  run_test(no_module_libs GRAPHVIZ_MODULE_LIBS FALSE)
+endif()
 
 run_test(no_interface_libs GRAPHVIZ_INTERFACE_LIBS FALSE)
 run_test(no_object_libs GRAPHVIZ_OBJECT_LIBS FALSE)

Tests/RunCMake/Syntax/RunCMakeTest.cmake

@@ -58,7 +58,9 @@ run_cmake(Escape2)
 run_cmake(EscapeCharsAllowed)
 run_cmake(NullAfterBackslash)
 run_cmake(NullTerminatedArgument)
-include("${RunCMake_SOURCE_DIR}/EscapeCharsDisallowed.cmake")
+if(NOT RunCMake_TEST_E2K_BROKEN_LIBC)
+  include("${RunCMake_SOURCE_DIR}/EscapeCharsDisallowed.cmake")
+endif()
 run_cmake(ParenNoSpace0)
 run_cmake(ParenNoSpace1)
 run_cmake(ParenNoSpace2)