configure: break a long line

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20108 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

configure

@@ -2163,7 +2163,8 @@ elif enabled x86; then
 EOF
 
     # check whether EBX is available on x86
-    check_asm ebx_available '""::"b"(0)' && check_asm ebx_available '"":::"%ebx"'
+    check_asm ebx_available '""::"b"(0)' &&
+        check_asm ebx_available '"":::"%ebx"'
 
     # check whether more than 10 operands are supported
     check_cc <<EOF && enable ten_operands