Copy gpgme-w32spawn.exe to workdir/LinkTarget/Executable

... to avoid "GpgME not installed correctly" message boxes during
unit tests. See the mail list thread started with
https://lists.freedesktop.org/archives/libreoffice/2018-October/081209.html

Change-Id: Ie57e6b5a7281d8f20ba97912f3413eafaac9cfd4
Reviewed-on: https://gerrit.libreoffice.org/61903
Tested-by: Jenkins
Tested-by: Jan-Marek Glogowski <glogow@fbihome.de>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>

external/gpgmepp/ExternalPackage_gpgmepp.mk

@@ -27,6 +27,9 @@ else ifeq ($(OS),WNT)
 
 $(eval $(call gb_ExternalPackage_add_file,gpgmepp,$(LIBO_LIB_FOLDER)/gpgme-w32spawn.exe,src/gpgme-w32spawn.exe))
 
+$(call gb_Package_get_target_for_build,gpgmepp):
+	cp $(call gb_UnpackedTarball_get_dir,gpgmepp)/src/gpgme-w32spawn.exe $(call gb_Executable__get_dir_for_exe,cppunittester)/gpgme-w32spawn.exe
+
 endif
 
 # If a tool executed during the build (like svidl) requires these gpgmepp libraries, it will also