remove conflict with sys/time.h macros

--- owamp/owamp.h.orig	Fri Jan 23 17:52:04 2009
+++ owamp/owamp.h	Tue Apr 21 18:03:37 2009
@@ -1627,8 +1627,8 @@ OWPTestDiskspace(
      ((tvp)->tv_sec cmp (uvp)->tv_sec))
 #endif
 
-#ifndef        timespecadd
-#define timespecadd(vvp, uvp)               \
+#ifndef        mytimespecadd
+#define mytimespecadd(vvp, uvp)               \
     do {                                    \
         (vvp)->tv_sec += (uvp)->tv_sec;     \
         (vvp)->tv_nsec += (uvp)->tv_nsec;   \
@@ -1639,8 +1639,8 @@ OWPTestDiskspace(
     } while (0)
 #endif
 
-#ifndef timespecsub
-#define timespecsub(vvp, uvp)               \
+#ifndef mytimespecsub
+#define mytimespecsub(vvp, uvp)               \
     do {                                    \
         (vvp)->tv_sec -= (uvp)->tv_sec;     \
         (vvp)->tv_nsec -= (uvp)->tv_nsec;   \
@@ -1662,7 +1662,7 @@ OWPTestDiskspace(
             ts1_ = *uvp;                    \
             ts2_ = *vvp;                    \
         }                                   \
-        timespecsub(&ts1_,&ts2_);           \
+        mytimespecsub(&ts1_,&ts2_);           \
         *vvp = ts1_;                        \
     } while(0)
 #endif