Remove winpthreads.h

MSVC build now needs NuGet pthreads package to compile
https://github.com/Hamlib/Hamlib/issues/1107

README.win32

@@ -85,3 +85,10 @@ same directory or in PATH as the resulting .exe otherwise it won't find it.
 
 Mark J. Fine
 Remington, Virginia, USA
+
+
+MSVC 2022
+=========
+MSVC C/C++ projects must use the NuGet pthread package in order to compile as of Sep 2022
+An example C++ project is in bindings/MSVC
+

include/Makefile.am

@@ -3,4 +3,4 @@ noinst_HEADERS = bandplan.h num_stdio.h
 nobase_include_HEADERS = hamlib/rig.h hamlib/riglist.h hamlib/rig_dll.h \
 		hamlib/rotator.h hamlib/rotlist.h hamlib/rigclass.h \
 		hamlib/rotclass.h hamlib/amplifier.h hamlib/amplist.h \
-		hamlib/ampclass.h hamlib/config.h hamlib/winpthreads.h
+		hamlib/ampclass.h hamlib/config.h

include/hamlib/rig.h

@@ -37,11 +37,12 @@
 #include <string.h>
 #include <inttypes.h>
 #include <time.h>
+
+// For MSVC install the NUGet pthread package
 #if defined(_MSC_VER)
-#include <winpthreads.h>
-#else
-#include <pthread.h>
+#define HAVE_STRUCT_TIMESPEC
 #endif
+#include <pthread.h>
 
 /* Rig list is in a separate file so as not to mess up w/ this one */
 #include <hamlib/riglist.h>