Add WORKAROUND style definitions for public use.

test/build.jam

@@ -59,6 +59,10 @@ test-suite predef :
     [ compile macos_vs_bsd.c : [ predef-require "BOOST_OS_MACOS" : cpp ] ]
     [ run check_value.cpp : : : <test-info>always_show_run_output
         [ predef-check "BOOST_COMP_CLANG > 0.0.0" "BOOST_OS_LINUX == 0" : : <cxxflags>-DCHECK_VALUE=true ] ]
+    [ run workaround.cpp ]
+    [ compile workaround_strict_config.cpp ]
+    [ run tested_at.cpp ]
+    [ compile-fail tested_at_outdated.cpp : <test-info>always_show_run_output ]
     ;
 
 # Minimal testing done for predef for CI. Since