* support/Util/SDCCerr.h,

* support/Util/SDCCerr.h,
* support/Util/SDCCerr.c,
* src/SDCC.y (struct_or_union_specifier, enum_specifier,
enumerator_list),
* src/SDCCsymt.c (addSymChain): show location of oriignal definition
for symbol conflicts.
* support/valdiags/tests/enum.c,
* support/valdiags/tests/tentdecl.c,
* support/valdiags/tests/struct.c: expect possible error messages
referring to original symbol definitions.
* src/SDCC.y (struct_or_union_specifier, struct_declarator),
* src/SDCCsymt.h,
* src/SDCCsymt.c (promoteAnonStructs): support anonymous struct/union

git-svn-id: https://sdcc.svn.sourceforge.net/svnroot/sdcc/trunk/sdcc@3245 4a8a32a2-be11-0410-ad9d-d568d2c75423