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GetDlgItemTextW_alloc: use the right memchr.
When retrieving Unicode text from an edit box in the GUI configurer, we were using plain memchr() to look for a terminating NUL. But of course you have to use wmemchr() to look for a UTF-16 NUL, or else memchr() will generate a false positive on the UTF-16 version of (at least) any ASCII character! (I also have to provide a fallback implementation of wmemchr for the w32old builds, which don't have it in the libc they build against. It's as simple as possible, and we use the libc version where possible.)
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@ -15,6 +15,7 @@
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#cmakedefine01 HAVE_GETNAMEDPIPECLIENTPROCESSID
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#cmakedefine01 HAVE_SETDEFAULTDLLDIRECTORIES
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#cmakedefine01 HAVE_STRTOUMAX
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#cmakedefine01 HAVE_WMEMCHR
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#cmakedefine01 HAVE_DWMAPI_H
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#cmakedefine NOT_X_WINDOWS
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@ -53,6 +53,7 @@ define_negation(NO_HTMLHELP HAVE_HTMLHELP_H)
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check_include_files("winsock2.h;afunix.h" HAVE_AFUNIX_H)
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check_symbol_exists(strtoumax "inttypes.h" HAVE_STRTOUMAX)
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check_symbol_exists(wmemchr "wchar.h" HAVE_WMEMCHR)
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check_symbol_exists(AddDllDirectory "windows.h" HAVE_ADDDLLDIRECTORY)
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check_symbol_exists(SetDefaultDllDirectories "windows.h"
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HAVE_SETDEFAULTDLLDIRECTORIES)
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