bugfixes for wide-char compiler/cpp

Rev: src/lexer.h:1.4
Rev: src/modules/Makefile.in:1.25
Rev: src/preprocessor.h:1.4
Rev: src/stralloc.c:1.55
Rev: src/stralloc.h:1.32
Rev: src/stuff.c:1.9
Rev: src/stuff.h:1.7
Rev: src/testsuite.in:1.149