use the libc call on darwin so sysctlbyname works

core/time/tsc_linux.odin

@@ -5,12 +5,7 @@ package time
 import "core:intrinsics"
 import "core:sys/unix"
 
-_get_tsc_frequency :: proc "contextless" () -> u64 {
-	@(static) frequency : u64 = 0
-	if frequency > 0 {
-		return frequency
-	}
-
+_get_tsc_frequency :: proc "contextless" () -> (u64, bool) {
 	perf_attr := unix.Perf_Event_Attr{}
 	perf_attr.type = u32(unix.Perf_Type_Id.Hardware)
 	perf_attr.config = u64(unix.Perf_Hardware_Id.Instructions)
@@ -18,26 +13,23 @@ _get_tsc_frequency :: proc "contextless" () -> u64 {
 	perf_attr.flags = {.Disabled, .Exclude_Kernel, .Exclude_HV}
 	fd := unix.sys_perf_event_open(&perf_attr, 0, -1, -1, 0)
 	if fd == -1 {
-		frequency = 1
-		return 0
+		return 0, false
 	}
 	defer unix.sys_close(fd)
 
 	page_size : uint = 4096
 	ret := unix.sys_mmap(nil, page_size, unix.PROT_READ, unix.MAP_SHARED, fd, 0)
 	if ret < 0 && ret > -4096 {
-		frequency = 1
-		return 0
+		return 0, false
 	}
 	addr := rawptr(uintptr(ret))
 	defer unix.sys_munmap(addr, page_size)
 
 	event_page := (^unix.Perf_Event_mmap_Page)(addr)
 	if .User_Time not_in event_page.cap.flags {
-		frequency = 1
-		return 0
+		return 0, false
 	}
 
-	frequency = u64((u128(1_000_000_000) << u128(event_page.time_shift)) / u128(event_page.time_mult))
-	return frequency
+	frequency := u64((u128(1_000_000_000) << u128(event_page.time_shift)) / u128(event_page.time_mult))
+	return frequency, true
 }