t1308-config-set.sh fails on current master

["Øyvind A. Holm" <sunny@sunbase.org>]

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t1308-config-set.sh fails on current master (v2.13.1-449-g02a2850ad58e). 
The error is introduced by commit e2d90fd1c33a ("config.mak.uname: set 
FREAD_READS_DIRECTORIES for Linux and FreeBSD"). Reverting the commit 
results in a conflict, but the test works on the commit before, 
02912f477586.

Tested on

  Debian GNU/Linux 8.8 (jessie)
  Linux Mint 18 Sarah

Test output:

  $ ./t1308-config-set.sh
  ok 1 - setup default config
  ok 2 - get value for a simple key
  ok 3 - get value for a key with value as an empty string
  ok 4 - get value for a key with value as NULL
  ok 5 - upper case key
  ok 6 - mixed case key
  ok 7 - key and value with mixed case
  ok 8 - key with case sensitive subsection
  ok 9 - key with case insensitive section header
  ok 10 - key with case insensitive section header & variable
  ok 11 - find value with misspelled key
  ok 12 - find value with the highest priority
  ok 13 - find integer value for a key
  ok 14 - find string value for a key
  ok 15 - check line error when NULL string is queried
  ok 16 - find integer if value is non parse-able
  ok 17 - find bool value for the entered key
  ok 18 - find multiple values
  ok 19 - find value from a configset
  ok 20 - find value with highest priority from a configset
  ok 21 - find value_list for a key from a configset
  ok 22 - proper error on non-existent files
  not ok 23 - proper error on directory "files"
  #
  #               echo "Error (-1) reading configuration file a-directory." >expect &&
  #               mkdir a-directory &&
  #               test_expect_code 2 test-config configset_get_value foo.bar a-directory 2>output &&
  #               grep "^warning:" output &&
  #               grep "^Error" output >actual &&
  #               test_cmp expect actual
  #
  ok 24 - proper error on non-accessible files
  ok 25 - proper error on error in default config files
  ok 26 - proper error on error in custom config files
  ok 27 - check line errors for malformed values
  ok 28 - error on modifying repo config without repo
  ok 29 - iteration shows correct origins
  # failed 1 among 29 test(s)
  1..29
  $

Øyvind

N 60.376° E 5.3334°
OpenPGP fingerprint: A006 05D6 E676 B319 55E2  E77E FB0C BEE8 94A5 06E5
2daabdde-509d-11e7-a17a-db5caa6d21d3

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