Have Windows installers modify PATH (fixes #1054)

ChangeLog

@@ -1,5 +1,9 @@
 2023-12-23  Jay Berkenbilt  <ejb@ql.org>
 
+	* Define CPACK_NSIS_MODIFY_PATH for the Windows builds so the
+	official installers will offer to modify PATH when installing
+	qpdf. Fixes #1054.
+
 	* Add QPDFAcroFormDocumentHelper::disableDigitalSignatures and the
 	--disable-signatures command-line argument. This disables any
 	digital signature fields, leaving their visual representations

cmake-win

@@ -31,6 +31,7 @@ if [ "$mode" = "maint" ]; then
 elif [ "$mode" = "ci" ]; then
     args=("${args[@]}" -DCI_MODE=1 -DINSTALL_MANUAL=1)
 fi
+args=("${args[@]}" -DCPACK_NSIS_MODIFY_PATH=ON)
 
 set -x
 cmake "${args[@]}" $dir

manual/release-notes.rst

@@ -85,6 +85,9 @@ Planned changes for future 12.x (subject to change):
       ``README-maintainer.md`` for a detailed explanation of how to
       maintain this.
 
+    - The official Windows installers now offers to modify ``PATH``
+      when installing qpdf.
+
   - Package Enhancements:
 
     - A UNIX man page is now automatically generated from the