Cygwin: Remove autoconf variable INSTALL_LICENSE

Remove autoconf variable INSTALL_LICENSE, which has a constant value
which is only used once.

winsup/Makefile.in

@@ -44,8 +44,6 @@ SUBDIRS=@subdirs@
 INSTALL_SUBDIRS=${patsubst %,install_%,$(SUBDIRS)}
 CLEAN_SUBDIRS=${patsubst %,clean_%,$(SUBDIRS)}
 
-INSTALL_LICENSE:=@INSTALL_LICENSE@
-
 .PHONY: all install clean distclean all-info info install-info install-license check \
 	$(SUBDIRS) $(INSTALL_SUBDIRS) $(CLEAN_SUBDIRS)
 
@@ -67,7 +65,7 @@ install-license: CYGWIN_LICENSE COPYING
 	  ${INSTALL} $$i $(DESTDIR)$(prefix)/share/doc/Cygwin ; \
 	done
 
-install: Makefile $(INSTALL_LICENSE) $(INSTALL_SUBDIRS)
+install: Makefile install-license $(INSTALL_SUBDIRS)
 
 clean distclean: $(CLEAN_SUBDIRS)
 

winsup/configure

@@ -589,7 +589,6 @@ ac_no_link=no
 enable_option_checking=no
 ac_subst_vars='LTLIBOBJS
 LIBOBJS
-INSTALL_LICENSE
 subdirs
 cygwin_headers
 newlib_headers
@@ -3453,10 +3452,6 @@ if test "x$with_cross_bootstrap" != "xyes"; then
 
 fi
 
-INSTALL_LICENSE="install-license"
-
-
-
 ac_config_files="$ac_config_files Makefile"
 
 cat >confcache <<\_ACEOF

winsup/configure.ac

@@ -39,9 +39,5 @@ if test "x$with_cross_bootstrap" != "xyes"; then
     AC_CONFIG_SUBDIRS([utils])
 fi
 
-INSTALL_LICENSE="install-license"
-
-AC_SUBST(INSTALL_LICENSE)
-
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT