mbrtowc.m4 on mingw32

[Bruno Haible]

Hi,

On mingw32, mbrtowc.m4 "detects" that mbrtowc() exists, leading to
link errors. Actually, mbrtowc() does not exist on this system,
it's only declared in <wchar.h> but not actually implemented under
this name. config.log shows this:

configure:26506: checking whether mbrtowc and mbstate_t are properly declared
configure:26527: i586-mingw32msvc-gcc -Wall -o conftest.exe -g -O2   
conftest.c  >&5
conftest.c: In function `main':
conftest.c:86: warning: the address of `mbrtowc', will always evaluate as 
`true'
configure:26533: $? = 0

The appended patch fixes it. OK, Paul?

Bruno

mbrtowc-mingw32
Description: Text Data