dev-scheme/guile: Also look for tgoto in libtinfo (bug #539316)

This is the case when ncurses is built with USE=tinfo.

Gentoo-Bug: https://bugs.gentoo.org/539316

dev-scheme/guile/files/guile-1.8.8-tinfo.patch

@@ -0,0 +1,15 @@
+With ncurses[tinfo] tgoto will be in libtinfo
+
+https://bugs.gentoo.org/539316
+
+--- a/guile-readline/configure.in
++++ b/guile-readline/configure.in
+@@ -33,7 +33,7 @@ if test "$MINGW32" = "yes" ; then
+ fi
+ AC_SUBST(EXTRA_DEFS)
+
+-for termlib in ncurses curses termcap terminfo termlib ; do
++for termlib in ncurses curses termcap terminfo termlib tinfo ; do
+    AC_CHECK_LIB(${termlib}, tgoto,
+                 [LIBS="-l${termlib} $LIBS"; break])
+ done

dev-scheme/guile/guile-1.8.8-r2.ebuild

@@ -36,6 +36,7 @@ src_prepare() {
 		"${FILESDIR}/${P}-gcc5.patch" \
 		"${FILESDIR}/${P}-makeinfo-5.patch" \
 		"${FILESDIR}/${P}-gtexinfo-5.patch" \
+		"${FILESDIR}/${P}-tinfo.patch" \
 		"${FILESDIR}/${P}-sandbox.patch"
 
 	sed \