Fix balance diagnostics push-pop for gcc (PR 19 extra, PR #83)

Author: martinmoene

include/lest/lest.hpp

@@ -104,7 +104,7 @@
 # define lest_RESTORE_WARNINGS    _Pragma( "clang diagnostic pop"  )
 
 #elif defined (__GNUC__)
-# define lest_SUPPRESS_WMISBRACES /*empty*/
+# define lest_SUPPRESS_WMISBRACES _Pragma( "GCC diagnostic push" )
 # define lest_SUPPRESS_WSHADOW    _Pragma( "GCC diagnostic push" ) \
                                   _Pragma( "GCC diagnostic ignored \"-Wshadow\"" )
 # define lest_SUPPRESS_WUNUSED    _Pragma( "GCC diagnostic push" ) \