build: add check for CLOCK_MONOTONIC_COARSE

This was added to the deprecated autotools build but not the CMake based
build.  Synchronize the two.

Author: compnerd

CMakeLists.txt

@@ -211,6 +211,7 @@ check_symbol_exists(CLOCK_UPTIME "time.h" HAVE_DECL_CLOCK_UPTIME)
 check_symbol_exists(CLOCK_UPTIME_FAST "time.h" HAVE_DECL_CLOCK_UPTIME_FAST)
 check_symbol_exists(CLOCK_MONOTONIC "time.h" HAVE_DECL_CLOCK_MONOTONIC)
 check_symbol_exists(CLOCK_REALTIME "time.h" HAVE_DECL_CLOCK_REALTIME)
+check_symbol_exists(CLOCK_MONOTONIC_COARSE "time.h" HAVE_DECL_CLOCK_MONOTONIC_COARSE)
 check_symbol_exists(FD_COPY "sys/select.h" HAVE_DECL_FD_COPY)
 check_symbol_exists(NOTE_LOWAT "sys/event.h" HAVE_DECL_NOTE_LOWAT)
 check_symbol_exists(NOTE_NONE "sys/event.h" HAVE_DECL_NOTE_NONE)

cmake/config.h.in

@@ -21,6 +21,10 @@
    you don't. */
 #cmakedefine01 HAVE_DECL_CLOCK_UPTIME_FAST
 
+/* Define to 1 if you have the declaration of `CLOCK_MONOTONIC_COARSE', and to
+   0 if you don't. */
+#cmakedefine01 HAVE_CLOCK_MONOTONIC_COARSE
+
 /* Define to 1 if you have the declaration of `FD_COPY', and to 0 if you
    don't. */
 #cmakedefine01 HAVE_DECL_FD_COPY