Document fixing MinGW warnings and linker error

This commit has been left as documentation should these files be moved
to /doc or some such.  However, never of these files are built or
distributed.

----------------

From example.c the following warning was generated by MinGW:

  CC       example.o
example.c: In function ‘main’:
example.c:93:32: warning: format ‘%lX’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘rmode_t’ {aka ‘long long unsigned int’} [-Wformat=]
   93 |     printf("Current mode = 0x%lX = %s, width = %ld\n", mode, rig_strrmode(mode),
      |                              ~~^                       ~~~~
      |                                |                       |
      |                                long unsigned int       rmode_t {aka long long unsigned int}
      |                              %llX

The 'l' was added as suggested to the format specifier but that resulted
in the following warning from Linux:

  CC       example.o
../../hamlib/tests/example.c:93:57: warning: format specifies type 'unsigned long long' but the argument has type 'rmode_t' (aka 'unsigned long') [-Wformat]
    printf("Current mode = 0x%llX = %s, width = %ld\n", mode, rig_strrmode(mode),
                             ~~~~                       ^~~~
                             %lX
  CC       rigctl-dumpcaps.o
1 warning generated.

So casting `mode` to `unsigned long long` quelled both warnings!

From testsecurity.c came this warning:

  CC       testsecurity-testsecurity.o
In file included from ../include/hamlib/rig.h:49,
                 from ../src/misc.h:26,
                 from testsecurity.c:29:
/usr/share/mingw-w64/include/winsock2.h:15:2: warning: #warning Please include winsock2.h before windows.h [-Wcpp]
   15 | #warning Please include winsock2.h before windows.h
      |  ^~~~~~~

Apparently winsock2.h being included through misc.h didn't work.

Finally, the Mingw linker gave the following error:

 CCLD     testsecurity.exe
/usr/bin/x86_64-w64-mingw32-ld: testsecurity-testsecurity.o: in function `main':
/home/nate/builds/hamlib-4.7~git/tests/testsecurity.c:97:(.text.startup+0x87): undefined reference to `AESStringCrypt'
/usr/bin/x86_64-w64-mingw32-ld: /home/nate/builds/hamlib-4.7~git/tests/testsecurity.c:116:(.text.startup+0x128): undefined reference to `AESStringDecrypt'
collect2: error: ld returned 1 exit status

Specifcally add the libsecurity.la file path as a specific library.
Even though the libhamlib.la seems to have the AESStringCrypt symbol
already.

tests/Makefile.am

@@ -57,7 +57,9 @@ rigctlsync_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS) -I$(top_builddir)/security
 if HAVE_LIBUSB
     rigtestlibusb_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS) $(LIBUSB_CFLAGS)
 endif
-testsecurity_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS) -I$(top_srcdir)/security
+
+# Document building testsecurity
+### testsecurity_CFLAGS = $(AM_CFLAGS) $(PTHREAD_CFLAGS) -I$(top_srcdir)/security
 
 rigctl_LDADD = $(PTHREAD_LIBS) $(READLINE_LIBS) $(LDADD)
 rigctld_LDADD = $(NET_LIBS) $(PTHREAD_LIBS) $(LDADD) $(READLINE_LIBS)
@@ -73,6 +75,9 @@ if HAVE_LIBUSB
     rigtestlibusb_LDADD = $(LIBUSB_LIBS)
 endif
 
+# Document linking testsecurity
+### testsecurity_LDADD = $(PTHREAD_LIBS) $(LDADD) $(top_builddir)/security/libsecurity.la
+
 # Linker options
 rigctl_LDFLAGS = $(WINEXELDFLAGS)
 rigswr_LDFLAGS = $(WINEXELDFLAGS)
@@ -90,6 +95,8 @@ if HAVE_LIBUSB
     rigtestlibusb_LDFLAGS = $(WINEXELDFLAGS)
 endif
 
+# Document linking testsecurity with MinGW
+### testsecurity_LDFLAGS = $(WINEXELDFLAGS)
 
 if HTML_MATRIX
 EXTRA_PROGRAMS = rigmatrix

tests/example.c

@@ -90,7 +90,7 @@ int main()
 
     if (status != RIG_OK) { printf("Get mode failed?? Err=%s\n", rigerror(status)); }
 
-    printf("Current mode = 0x%lX = %s, width = %ld\n", mode, rig_strrmode(mode),
+    printf("Current mode = 0x%llX = %s, width = %ld\n", (unsigned long long)mode, rig_strrmode(mode),
            width);
 
     /* rig power output */

tests/testsecurity.c

@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <string.h>
 #ifdef _WIN32
+#include <winsock2.h>
 #include <windows.h>
 //#include <Wincrypt.h>
 #else