terminal-util: move acquire_terminal() and AcquireTerminalFlags back together in header file

src/basic/terminal-util.h

@@ -50,6 +50,9 @@ typedef enum AcquireTerminalFlags {
         ACQUIRE_TERMINAL_PERMISSIVE = 1 << 2,
 } AcquireTerminalFlags;
 
+int acquire_terminal(const char *name, AcquireTerminalFlags flags, usec_t timeout);
+int release_terminal(void);
+
 /* Limits the use of ANSI colors to a subset. */
 typedef enum ColorMode {
         COLOR_OFF,   /* No colors, monochrome output. */
@@ -63,9 +66,6 @@ typedef enum ColorMode {
 const char* color_mode_to_string(ColorMode m) _const_;
 ColorMode color_mode_from_string(const char *s) _pure_;
 
-int acquire_terminal(const char *name, AcquireTerminalFlags flags, usec_t timeout);
-int release_terminal(void);
-
 int terminal_vhangup_fd(int fd);
 
 int terminal_set_size_fd(int fd, const char *ident, unsigned rows, unsigned cols);