Attached patch OK? Fixes the following warnings:
coreutils-sum-pr108666.c:17:1: warning: conflicting types for built-in function ‘memcpy’; expected ‘void *(void *, const void *, long long unsigned int)’ [-Wbuiltin-declaration-mismatch]
    17 | memcpy(void* __restrict __dest, const void* __restrict __src, size_t __n)
       | ^~~~~~

coreutils-sum-pr108666.c:25:1: warning: conflicting types for built-in function ‘malloc’; expected ‘void *(long long unsigned int)’ [-Wbuiltin-declaration-mismatch]
    25 | malloc(size_t __size) __attribute__((__nothrow__, __leaf__))
       | ^~~~~~

Copied for review convenience:
diff --git a/gcc/testsuite/c-c++-common/analyzer/coreutils-sum-pr108666.c b/gcc/testsuite/c-c++-common/analyzer/coreutils-sum-pr108666.c
index 5684d1b02d4..dadd27eaf41 100644
--- a/gcc/testsuite/c-c++-common/analyzer/coreutils-sum-pr108666.c
+++ b/gcc/testsuite/c-c++-common/analyzer/coreutils-sum-pr108666.c
@@ -1,6 +1,6 @@
  /* Reduced from coreutils's sum.c: bsd_sum_stream */
  
-typedef long unsigned int size_t;
+typedef __SIZE_TYPE__ size_t;
  typedef unsigned char __uint8_t;
  typedef unsigned long int __uintmax_t;
  typedef struct _IO_FILE FILE;