Add expected output file for descrec test in C locale (#131)

When running with LC_ALL=C, SQL_DESC_OCTET_LENGTH matches the character
length. Add "10" as accepted value.

The net diff to the existing descrec.out file is this:

--- test/expected/descrec.out	2025-06-13 19:02:36.460302799 +0200
+++ test/expected/descrec_2.out	2025-06-16 14:34:44.270543393 +0200
@@ -19,7 +19,7 @@
 -- Column 3 --
 SQL_DESC_NAME: col3
 SQL_DESC_TYPE: 12
-SQL_DESC_OCTET_LENGTH: 40
+SQL_DESC_OCTET_LENGTH: 10
 SQL_DESC_PRECISION: 0
 SQL_DESC_SCALE: 0
 SQL_DESC_NULLABLE: 0

Fixes #51.

Author: df7cb

test/expected/descrec_2.out

@@ -0,0 +1,34 @@
+connected
+
+-- Column 1 --
+SQL_DESC_NAME: col1
+SQL_DESC_TYPE: 4
+SQL_DESC_OCTET_LENGTH: 0
+SQL_DESC_PRECISION: 0
+SQL_DESC_SCALE: 0
+SQL_DESC_NULLABLE: 0
+
+-- Column 2 --
+SQL_DESC_NAME: col2
+SQL_DESC_TYPE: 2
+SQL_DESC_OCTET_LENGTH: 6
+SQL_DESC_PRECISION: 4
+SQL_DESC_SCALE: 2
+SQL_DESC_NULLABLE: 1
+
+-- Column 3 --
+SQL_DESC_NAME: col3
+SQL_DESC_TYPE: 12
+SQL_DESC_OCTET_LENGTH: 10
+SQL_DESC_PRECISION: 0
+SQL_DESC_SCALE: 0
+SQL_DESC_NULLABLE: 0
+
+-- Column 4 --
+SQL_DESC_NAME: col4
+SQL_DESC_TYPE: -5
+SQL_DESC_OCTET_LENGTH: 8
+SQL_DESC_PRECISION: 0
+SQL_DESC_SCALE: 0
+SQL_DESC_NULLABLE: 0
+disconnecting