bc,dc: make BC_LINE_LENGTH/DC_LINE_LENGTH more compatible with GNU

function                                             old     new   delta
xc_vm_init                                           640     682     +42

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/dc_add_results.txt b/testsuite/dc_add_results.txt
index 542a62e..2d95593 100644
--- a/testsuite/dc_add_results.txt
+++ b/testsuite/dc_add_results.txt
@@ -9,9 +9,9 @@
 1998
 324869359109479
 2378639108055453348401
-78562139406792834691802347619083467219846713490861872324967138636055\
-45508706362018540498696043776980521464405852627147161556994835657433\
-00967298
+785621394067928346918023476190834672198467134908618723249671386360554\
+550870636201854049869604377698052146440585262714716155699483565743300\
+967298
 1.1
 1.1
 37842935130118.1187478621432354
@@ -20,21 +20,21 @@
 -2
 -19
 -1287904651762470260258
-100000000000000000000000000000000000000000000000000000000000.0000000\
-00000000000000000000000000000000000000000000000000000000000000000000\
-000000000000000000000000000000000000000000000
-100000000000000000000000000000000000000000000000000000000000.0000000\
-00000000000000000000000000000000000000000000000000000000000000000000\
-000000000000000000000000000000000000000000000
-100000000000000000000000000000000000000000000000000000000000.0000000\
-00000000000000000000000000000000000000000000000000000000000000000000\
-000000000000000000000000000000000000000009999
-99999999999999999999999999999999999999999999999999999999999.99999999\
-99999999999999999999999999999999999999999999999999000000000000000000\
-00000000000000000000000000000000000000009999
-99999999999999999999999999999999999990000000000000000000000.00000000\
-00000000000000000000000000000000000000000000000000000000000000000000\
-00000000000000000000000000000000000000009999
+100000000000000000000000000000000000000000000000000000000000.00000000\
+000000000000000000000000000000000000000000000000000000000000000000000\
+0000000000000000000000000000000000000000000
+100000000000000000000000000000000000000000000000000000000000.00000000\
+000000000000000000000000000000000000000000000000000000000000000000000\
+0000000000000000000000000000000000000000000
+100000000000000000000000000000000000000000000000000000000000.00000000\
+000000000000000000000000000000000000000000000000000000000000000000000\
+0000000000000000000000000000000000000009999
+99999999999999999999999999999999999999999999999999999999999.999999999\
+999999999999999999999999999999999999999999999999900000000000000000000\
+000000000000000000000000000000000000009999
+99999999999999999999999999999999999990000000000000000000000.000000000\
+000000000000000000000000000000000000000000000000000000000000000000000\
+000000000000000000000000000000000000009999
 122761518
 -14338.391079082
 -2422295.6865057444