configure: remove \r from cc_ident,

This should fix cygwin + non-cygwin toolchain
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

configure

@@ -424,7 +424,7 @@ sh_quote(){
 }
 
 cleanws(){
-    echo "$@" | sed 's/^ *//;s/  */ /g;s/ *$//'
+    echo "$@" | sed 's/^ *//;s/  */ /g;s/ *$//;s/\r//g'
 }
 
 filter(){