Add string_contains_word_strv()

I had to move STRV_MAKE to macro.h. There is a circular dependency between
extract-word.h, strv.h, and string-util.h that makes it hard to define the
inline function otherwise.

src/basic/macro.h

@@ -538,6 +538,9 @@ static inline int __coverity_check_and_return__(int condition) {
                 (y) = (_t);                        \
         } while (false)
 
+#define STRV_MAKE(...) ((char**) ((const char*[]) { __VA_ARGS__, NULL }))
+#define STRV_MAKE_EMPTY ((char*[1]) { NULL })
+
 /* Iterates through a specified list of pointers. Accepts NULL pointers, but uses (void*) -1 as internal marker for EOL. */
 #define FOREACH_POINTER(p, x, ...)                                                      \
         for (typeof(p) *_l = (typeof(p)[]) { ({ p = x; }), ##__VA_ARGS__, (void*) -1 }; \