perl: remove PERL_INSTALL_TARGET_GOALS

useless since previous commit (removal of BR2_HAVE_DOCUMENTATION)
see http://git.buildroot.net/buildroot/diff/package/perl/perl.mk?id=7164a32632d14cb83698ddec45e84ad2f3252e9e

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Acked-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/perl/perl.mk

@@ -90,10 +90,8 @@ define PERL_INSTALL_STAGING_CMDS
 	$(MAKE1) -C $(@D) DESTDIR="$(STAGING_DIR)" install.perl
 endef
 
-PERL_INSTALL_TARGET_GOALS = install.perl
-
 define PERL_INSTALL_TARGET_CMDS
-	$(MAKE1) -C $(@D) DESTDIR="$(TARGET_DIR)" $(PERL_INSTALL_TARGET_GOALS)
+	$(MAKE1) -C $(@D) DESTDIR="$(TARGET_DIR)" install.perl
 endef
 
 $(eval $(generic-package))