DO NOT MERGE: The future is now.

__INTRODUCED_IN_FUTURE -> __INTRODUCED_IN(26)

Bug: http://b/37437368
Test: treehugger
Change-Id: I601a23da83b65a0cd582cc840ed3856a9031b673
(cherry picked from commit cb302f932a3532f1484e1e70894e9b1199384283)
diff --git a/libc/include/sys/system_properties.h b/libc/include/sys/system_properties.h
index c0bd445..d075859 100644
--- a/libc/include/sys/system_properties.h
+++ b/libc/include/sys/system_properties.h
@@ -58,7 +58,7 @@
  */
 void __system_property_read_callback(const prop_info *pi,
     void (*callback)(void* cookie, const char *name, const char *value, uint32_t serial),
-    void* cookie) __INTRODUCED_IN_FUTURE;
+    void* cookie) __INTRODUCED_IN(26);
 
 /*
  * Passes a `prop_info` for each system property to the provided
@@ -86,7 +86,7 @@
                             uint32_t old_serial,
                             uint32_t* new_serial_ptr,
                             const struct timespec* relative_timeout)
-    __INTRODUCED_IN_FUTURE;
+    __INTRODUCED_IN(26);
 
 /* Deprecated. In Android O and above, there's no limit on property name length. */
 #define PROP_NAME_MAX   32