Rewrite the wrappers of strncpy & strncat:

Add one argument about the allocation of the dest buffer
Theses wrappers are internal (so no impact to API)
and only used in a few place in m-string.
This make the wrappers able to use the function
strncpy_s & strncat_s for MSVC rather than using
reimplementation of the original functions.

m-core.h

@@ -1756,41 +1756,15 @@ m_core_fopen(const char filename[], const char opt[])
     if (err) return NULL;
     return f;
 }
-/* Rewrite strncpy (Cannot use strncpy_s as its semantic is too bothersome) */
-static inline void m_core_strncpy(char s1[], const char s2[], size_t size)
-{
-  while (size > 0) {
-    *s1 = *s2;
-    s1 ++;
-    s2 += (*s2 != 0);
-    size --;
-  }
-  // No final null char (it may not appear in case of truncation)
-}
-/* Rewrite strncat (Cannot use strncat_s as its semantic is too bothersome) */
-static inline void m_core_strncat(char s1[], const char s2[], size_t size)
-{
-  // Go to the end of s1
-  while (*s1 != 0) {
-    s1++;
-  }
-  // Copy at most size bytes of s2 in s1.
-  while (size > 0)
-  {
-    *s1 = *s2;
-    if (*s2 == 0) {
-      break;
-    }
-    s1 ++;
-    s2 ++;
-    size --;
-  }
-  // Always a final null char.
-  *s1 = 0;
-}
+
+/* Wrapper around strncpy */
+#define m_core_strncpy(s1, alloc, s2, size) strncpy_s(s1, alloc, s2, size)
+
+/* Wrapper around strncat */
+#define m_core_strncat(s1, alloc, s2, size) strncat_s(s1, alloc, s2, size)
+
 /* Wrapper around fscanf_s */
 #define m_core_fscanf(...) fscanf_s(__VA_ARGS__)
-
 /* Macro to be used in m_core_fscanf for argument associated
  * to the format %c, %s or %[
  * in order to specify the size of the argument */
@@ -1801,9 +1775,9 @@ static inline void m_core_strncat(char s1[], const char s2[], size_t size)
 /* Wrapper around fopen */
 #define m_core_fopen(...) fopen(__VA_ARGS__)
 /* Wrapper around strncpy */
-#define m_core_strncpy(...) strncpy(__VA_ARGS__)
+#define m_core_strncpy(s1, alloc, s2, size) strncpy(s1, s2, size)
 /* Wrapper around strncat */
-#define m_core_strncat(s1, s2, size) strncat(s1, s2, size)
+#define m_core_strncat(s1, alloc, s2, size) strncat(s1, s2, size)
 /* Wrapper around fscanf */
 #define m_core_fscanf(...) fscanf(__VA_ARGS__)