libreoffice: fix build with gpgme 2

Since version 2.0.0 the C++ bindings to gpgme live in a separate
package, i.e., gpgmepp.

Signed-off-by: Marcin Serwin <marcin@serwin.dev>

pkgs/applications/office/libreoffice/default.nix

@@ -93,6 +93,7 @@
   ncurses,
   libepoxy,
   gpgme,
+  gpgmepp,
   libwebp,
   abseil-cpp,
   libepubgen,
@@ -358,7 +359,7 @@ stdenv.mkDerivation (finalAttrs: {
     # Fix this path to point to where the headers can actually be found instead.
     substituteInPlace configure.ac --replace-fail \
       'GPGMEPP_CFLAGS=-I/usr/include/gpgme++' \
-      'GPGMEPP_CFLAGS=-I${gpgme.dev}/include/gpgme++'
+      'GPGMEPP_CFLAGS=-I${lib.getDev gpgmepp}/include/gpgme++'
 
     # Fix for Python 3.12
     substituteInPlace configure.ac --replace-fail distutils.sysconfig sysconfig
@@ -422,6 +423,7 @@ stdenv.mkDerivation (finalAttrs: {
       glm
       adwaita-icon-theme
       gpgme
+      gpgmepp
       graphite2
       gtk3
       (harfbuzz.override { withIcu = true; })