util/StringAPI: add strpbrk() wrapper

src/util/StringAPI.hxx

@@ -94,6 +94,13 @@ StringFindLast(char *haystack, char needle) noexcept
 	return strrchr(haystack, needle);
 }
 
+gcc_pure gcc_nonnull_all
+static inline const char *
+StringFindAny(const char *haystack, const char *accept) noexcept
+{
+	return strpbrk(haystack, accept);
+}
+
 static inline char *
 StringToken(char *str, const char *delim) noexcept
 {

src/util/WStringAPI.hxx

@@ -90,6 +90,13 @@ StringFindLast(wchar_t *haystack, wchar_t needle) noexcept
 	return wcsrchr(haystack, needle);
 }
 
+gcc_pure gcc_nonnull_all
+static inline const wchar_t *
+StringFindAny(const wchar_t *haystack, const wchar_t *accept) noexcept
+{
+	return wcspbrk(haystack, accept);
+}
+
 gcc_nonnull_all
 static inline void
 UnsafeCopyString(wchar_t *dest, const wchar_t *src) noexcept