Add sonmae option in compiler switches. This patch is from openembedded 4e75705872fd9f289bbf4c74a912ca4710f50b93

Upstream-Status: Inappropriate [not author]

--- Makefile.orig	2005-04-20 18:12:45.000000000 +0200
+++ Makefile	2005-04-20 18:14:37.000000000 +0200
@@ -101,4 +101,4 @@
 libedit.a: ${OOBJS}
 	ar -r $@ .a/*
 libedit.so: ${OOBJS}
-	${CC} --shared -o $@ .so/* ${LIBS}
+	${CC} --shared -Wl,-soname=libedit.so.0 -o $@ .so/* ${LIBS}