Events: fixed test building with devpoll and eventport on Linux.

Avoid POLLREMOVE and itimerspec redefinition.

src/event/modules/ngx_devpoll_module.c

diff --git a/src/event/modules/ngx_devpoll_module.c b/src/event/modules/ngx_devpoll_module.c
index a932185..f985fbd 100644
--- a/src/event/modules/ngx_devpoll_module.c
+++ b/src/event/modules/ngx_devpoll_module.c
@@ -14,7 +14,9 @@
 
 /* Solaris declarations */
 
+#ifndef POLLREMOVE
 #define POLLREMOVE   0x0800
+#endif
 #define DP_POLL      0xD001
 #define DP_ISPOLLED  0xD002
 

src/event/modules/ngx_eventport_module.c

diff --git a/src/event/modules/ngx_eventport_module.c b/src/event/modules/ngx_eventport_module.c
index bacbb05..9184547 100644
--- a/src/event/modules/ngx_eventport_module.c
+++ b/src/event/modules/ngx_eventport_module.c
@@ -49,7 +49,7 @@
     void       *portnfy_user;   /* user defined */
 } port_notify_t;
 
-#if (__FreeBSD_version < 700005)
+#if (__FreeBSD__) && (__FreeBSD_version < 700005)
 
 typedef struct itimerspec {     /* definition per POSIX.4 */
     struct timespec it_interval;/* timer period */