include/tccdefs.h: moved and use it

tcc_define_symbol(): now only for -D on command line
include/tccdefs.h: converted to strings and compiled into
the tcc executable.  Can be disabled with
    ./configure --config-predefs=no
In this case include/tccdefs.h is loaded at runtime.  This is
default for other build-methods (build-tcc.bat) also (to avoid
some complexity).

Also:
- lib/Makefile: fix typo
- tcc.h : avoid _strto(u)i64 (for TCC on WIN98/2K)
- tccpp.h:cstr_printf() : workaround incompatible vsnprintf's
  (generally faster too)

Makefile

@@ -191,6 +191,8 @@ arm64_FILES = $(CORE_FILES) arm64-gen.c arm64-link.c arm-asm.c
 c67_FILES = $(CORE_FILES) c67-gen.c c67-link.c tcccoff.c
 riscv64_FILES = $(CORE_FILES) riscv64-gen.c riscv64-link.c riscv64-asm.c
 
+TCCDEFS_H$(subst yes,,$(CONFIG_predefs)) = tccdefs_.h
+
 # libtcc sources
 LIBTCC_SRC = $(filter-out tcc.c tcctools.c,$(filter %.c,$($T_FILES)))
 
@@ -199,11 +201,13 @@ LIBTCC_OBJ = $(X)libtcc.o
 LIBTCC_INC = $($T_FILES)
 TCC_FILES = $(X)tcc.o
 tcc.o : DEFINES += -DONE_SOURCE=0
+$(X)tcc.o $(X)libtcc.o  : $(TCCDEFS_H)
 else
 LIBTCC_OBJ = $(patsubst %.c,$(X)%.o,$(LIBTCC_SRC))
 LIBTCC_INC = $(filter %.h %-gen.c %-link.c,$($T_FILES))
 TCC_FILES = $(X)tcc.o $(LIBTCC_OBJ)
 $(TCC_FILES) : DEFINES += -DONE_SOURCE=0
+$(X)tccpp.o : $(TCCDEFS_H)
 endif
 
 ifeq ($(CONFIG_strip),no)
@@ -216,6 +220,10 @@ LDFLAGS += -s
 endif
 endif
 
+# convert "include/tccdefs.h" to "tccdefs_.h"
+%_.h : include/%.h tests/misc/c2str.c
+	$S$(CC) -o c2str.exe $(filter %.c,$^) && ./c2str.exe $< $@
+
 # target specific object rule
 $(X)%.o : %.c $(LIBTCC_INC)
 	$S$(CC) -o $@ -c $< $(DEFINES) $(CFLAGS)
@@ -402,8 +410,8 @@ testspp.%:
 	@$(MAKE) -C tests/pp $@
 
 clean:
-	@rm -f tcc$(EXESUF) tcc_p$(EXESUF) *-tcc$(EXESUF) tcc.pod
-	@rm -f *.o *.a *.so* *.out *.log lib*.def *.exe *.dll a.out tags TAGS *.dylib
+	@rm -f tcc$(EXESUF) tcc_p$(EXESUF) *-tcc$(EXESUF) tcc.pod tags ETAGS
+	@rm -f *.o *.a *.so* *.out *.log lib*.def *.exe *.dll a.out *.dylib *_.h
 	@$(MAKE) -s -C lib $@
 	@$(MAKE) -s -C tests $@