Makefile: Drop extra phony cscope

Commit d7986405 added a dedicated phony line for cscope.

Fixes: d7986405 ("Makefile: Add back TAGS/ctags/cscope rules")
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <159916246865.691541.16619858522304817323.stgit@bahia.lan>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

Makefile

@@ -128,7 +128,7 @@ build.ninja: config-host.mak
 Makefile: ;
 configure: ;
 
-.PHONY: all clean cscope distclean install \
+.PHONY: all clean distclean install \
 	recurse-all dist msi FORCE
 
 SUBDIR_MAKEFLAGS=$(if $(V),,--no-print-directory --quiet)