fix fuzzer build

Change-Id: Ibd2d1700c3bb69c6339110088ba531f95071ebd3
Reviewed-on: https://gerrit.libreoffice.org/46042Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/commonfuzzer.mk

@@ -22,6 +22,7 @@ fuzzer_externals = \
     cairo \
     fontconfig \
     freetype \
+    gpgmepp \
     icui18n \
     icuuc \
     icudata \
@@ -44,7 +45,6 @@ fuzzer_core_libraries = \
     avmedia \
     basegfx \
     canvastools \
-    comphelper \
     configmgr \
     cppcanvas \
     dbtools \