Add missing UTIME defines and TASK_RENAME_LENGTH

(backport <rust-lang#4407>)
(cherry picked from commit e119cae)

Author: hax0kartik

src/vxworks/mod.rs

@@ -745,6 +745,7 @@ pub const S_taskLib_ILLEGAL_PRIORITY: c_int = taskErrorBase + 0x0068;
 
 // FIXME(vxworks): could also be useful for TASK_DESC type
 pub const VX_TASK_NAME_LENGTH: c_int = 31;
+pub const VX_TASK_RENAME_LENGTH: c_int = 16;
 
 // semLibCommon.h
 pub const S_semLib_INVALID_STATE: c_int = semErrorBase + 0x0065;
@@ -806,6 +807,9 @@ pub const S_IWOTH: c_int = 0o0002;
 pub const S_IXOTH: c_int = 0o0001;
 pub const S_IRWXO: c_int = 0o0007;
 
+pub const UTIME_OMIT: c_long = 0x3ffffffe;
+pub const UTIME_NOW: c_long = 0x3fffffff;
+
 // socket.h
 pub const SOL_SOCKET: c_int = 0xffff;
 pub const SOMAXCONN: c_int = 128;