main/screen: update configure arguments

screen 5.* changed the arguments to its configure script.

--with-system_screenrc is the new way to spell that argument's name.
Since APKBUILD used that argument with its default value, the
misspelled argument was ignored but the right (default) path was still
used.

--enable-colors256 are --enable-rxvt_osc are gone.

The same config.h is generated by configure.

main/screen/APKBUILD

@@ -39,13 +39,11 @@ build() {
 		--host=$CHOST \
 		--prefix=/usr \
 		--sysconfdir=/etc \
-		--with-sys-screenrc=/etc/screenrc \
+		--with-system_screenrc=/etc/screenrc \
 		--mandir=/usr/share/man \
 		--infodir=/usr/share/info \
 		--localstatedir=/var \
-		--enable-colors256 \
-		--enable-telnet \
-		--enable-rxvt_osc
+		--enable-telnet
 	make
 }