ccan: update to latest.

[rustyrussell]

We fix the configure test which was bogus, and breaks on 32-bit gcc with optimization:

checking for unaligned access to int... ccan/tools/configurator/configurator: Test for HAVE_UNALIGNED_ACCESS did not compile:
configuratortest.c: In function 'main':
configuratortest.c:8:22: error: array subscript 'int[0]' is partly outside array bounds of 'char[4]' [-Werror=array-bounds]
     8 |         return *x == *y;
        |                      ^~
configuratortest.c:5:11: note: at offset 1 into object 'pad' of size 4
     5 |      char pad[sizeof(int *) * 1];
        |           ^~~
cc1: all warnings being treated as errors

And also removes sprintf() calls, which apparently MacOS no longer likes:

Environment: Sequoia 15.6.1 (24G90)
SDK Version: MacOSX15.sdk

ccan/ccan/closefrom/closefrom.c:83:2: error: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Werror,-Wdeprecated-declarations]
   83 |         sprintf(dnam, "/proc/%ld/fd", (long) getpid());
      |         ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h:278:1: note: 'sprintf' has been explicitly marked deprecated here
  278 | deprecated_msg("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead.")
      | ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h:218:48: note: expanded from macro 'deprecated_msg'
  218 |         #define deprecated_msg(_msg) attribute((deprecated(_msg)))
      |                                                       ^
ccan/ccan/closefrom/closefrom.c:162:2: error: 'sprintf' is deprecated: This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead. [-Werror,-Wdeprecated-declarations]
  162 |         sprintf(dnam, "/proc/%ld/fd", (long) getpid());
      |         ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/_stdio.h:278:1: note: 'sprintf' has been explicitly marked deprecated here
  278 | deprecated_msg("This function is provided for compatibility reasons only.  Due to security concerns inherent in the design of sprintf(3), it is highly recommended that you use snprintf(3) instead.")
      | ^
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/sys/cdefs.h:218:48: note: expanded from macro 'deprecated_msg'
  218 |         #define deprecated_msg(_msg) attribute((deprecated(_msg)))
      |                                                       ^
2 errors generated.
make: *** [ccan-closefrom.o] Error 1

Reported-by: Sangbida
Fixes: #8581
Reported-by: https://github.com/Raimo33
Fixes: #8501
Changelog-Fixed: build: we now build on MacOS without errors on the latest Command Line Tools (macOS 15 SDK).
Changelog-Fixes: build: fix build with -O2 on 32 bit arm (armhf)

Important

25.12 FREEZE October 27th: Non-bugfix PRs not ready by this date will wait for 26.03.

RC1 is scheduled on November 10th

The final release is scheduled for December 1st.

Checklist

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• The changelog has been updated in the relevant commit(s) according to the guidelines.
• Tests have been added or modified to reflect the changes.
• Documentation has been reviewed and updated as needed.
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