basic/allow-util: make free_many non-inline

Definition of free_many is moved to the .c file, no particular reason
for it to be inline and we can make the header file shorter.

src/basic/alloc-util.c

@@ -142,3 +142,10 @@ size_t malloc_sizeof_safe(void **xp) {
                 assert_not_reached();
         return sz;
 }
+
+void free_many(void **p, size_t n) {
+        assert(p || n == 0);
+
+        FOREACH_ARRAY(i, p, n)
+                *i = mfree(*i);
+}

src/basic/alloc-util.h

@@ -206,12 +206,7 @@ size_t malloc_sizeof_safe(void **xp);
                 VOID_0))
 
 /* Free every element of the array. */
-static inline void free_many(void **p, size_t n) {
-        assert(p || n == 0);
-
-        FOREACH_ARRAY(i, p, n)
-                *i = mfree(*i);
-}
+void free_many(void **p, size_t n);
 
 /* Typesafe wrapper for char** rather than void**. Unfortunately C won't implicitly cast this. */
 static inline void free_many_charp(char **c, size_t n) {