Checkpoint more Windows 11 Cygwin MINGW64 changes

CHANGES

@@ -26,6 +26,9 @@ The following are the changes from calc version 2.14.0.15 to date:
     Added ${WINGM} Makefile variable for users under Windows 11 who
     use Cygwin and the MinGW64 packages.
 
+    Updated README.WINDOWS for Windows 11 users based on advice
+    form a Microsoft 11 developer.
+
     Fixed missing quotes in the PASSDOWN makefile variables.
 
 

Makefile

@@ -1811,7 +1811,7 @@ CCWERR=
 CCOPT= ${DEBUG}
 CCMISC=
 #
-LCC= gcc
+LCC= x86_64-w64-mingw32-gcc
 CC= ${PURIFY} ${LCC} ${CCWERR}
 #
 endif

README.WINDOWS

@@ -31,7 +31,8 @@ We were given this advice from a Windows 11 developer:
 
         https://cygwin.com/install.html
 
-    and include all MinGW64 packages.
+    IMPORTANT: While installing Cygwin, and during Cygwin Setup, be sure to
+	       select all the MinGW64 packages relating to gcc.
 
 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 =-= Compiling calc via virtual machine under Windows 11 =-=