fdo#45071 Remove Libreoffice browser plugin

This removes ENABLE_NPAPI_INTO_BROWSER while it should keep
ENABLE_NPAPI_FROM_BROWSER (embed flash in LO) intact.

Signed-off-by: Stephan Bergmann <sbergman@redhat.com>
Conflicts:
	extensions/source/nsplugin/source/npshell.cxx

Change-Id: I80a9159a75653c74423d8fdc7c188568d3188e04
fdo#45071: Remove ENABLE_NPAPI_INTO_BROWSER left-overs

...from previous commit

Change-Id: I945faa6215f971ce817c6450fe0786da0696091f