add blackfin to config.sub. FSBUILD-5.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5457 d0543943-73ff-0310-b7d9-9358b9ac24b2

build/config/config.sub

@@ -226,6 +226,7 @@ case $basic_machine in
 	# Recognize the basic CPU types without company name.
 	# Some are omitted here because they have special meanings below.
 	1750a | 580 \
+	| bfin \
 	| a29k \
 	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \
 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \
@@ -292,6 +293,7 @@ case $basic_machine in
 		;;
 	# Recognize the basic CPU types with company name.
 	580-* \
+	| bfin-* \
 	| a29k-* \
 	| alpha-* | alphaev[4-8]-* | alphaev56-* | alphaev6[78]-* \
 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \