[flang][NFC] Add missing include for FreeBSD

tblah · tblah · commit 2583b2eea4a5 · 2024-04-17T19:57:15.000Z
Suggested by dankm here: #88517
diff --git a/flang/runtime/extensions.cpp b/flang/runtime/extensions.cpp
@@ -21,6 +21,7 @@
 #include <ctime>
 #include <signal.h>
 #include <thread>
+#include <unistd.h>
 
 #ifdef _WIN32
 inline void CtimeBuffer(char *buffer, size_t bufsize, const time_t cur_time,
