Remove unused imports

core/sync/primitives_darwin.odin

@@ -3,7 +3,6 @@
 package sync
 
 import "core:c"
-import "core:time"
 import "core:intrinsics"
 
 foreign import pthread "System.framework"

core/sync/primitives_freebsd.odin

@@ -3,7 +3,6 @@
 package sync
 
 import "core:os"
-import "core:time"
 
 _current_thread_id :: proc "contextless" () -> int {
 	return os.current_thread_id()

core/sync/primitives_linux.odin

@@ -3,7 +3,6 @@
 package sync
 
 import "core:sys/unix"
-import "core:time"
 
 _current_thread_id :: proc "contextless" () -> int {
 	return unix.sys_gettid()

core/sync/primitives_openbsd.odin

@@ -3,7 +3,6 @@
 package sync
 
 import "core:os"
-import "core:time"
 
 _current_thread_id :: proc "contextless" () -> int {
 	return os.current_thread_id()