[PATCH v3 (maint)] t/gitweb-lib: Don't pass constant to decode_utf8

[Brian Gernhardt <brian@gernhardtsoftware.com>]

Encode.pm started updating the string to decode in-place when
a second argument is passed in version 2.40.  This causes
'decode_utf8("", Encode::FB_CROAK)' to die with a message like:

Modification of a read-only value attempted at .../Encode.pm line 216.

Work around this by passing an empty variable instead of a constant
string.

Signed-off-by: Brian Gernhardt <brian@gernhardtsoftware.com>
Acked-by: Jakub Narebski <jnareb@gmail.com>
---
 Changes since v2:
 - Re-wrapped first paragraph for easier reading
 - Removed long OS X-specific Perl library path
 - Added Ack

 t/gitweb-lib.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/t/gitweb-lib.sh b/t/gitweb-lib.sh
index 81ef2a0..1b9523d 100644
--- a/t/gitweb-lib.sh
+++ b/t/gitweb-lib.sh
@@ -80,7 +80,7 @@ if ! test_have_prereq PERL; then
 	test_done
 fi
 
-perl -MEncode -e 'decode_utf8("", Encode::FB_CROAK)' >/dev/null 2>&1 || {
+perl -MEncode -e '$e="";decode_utf8($e, Encode::FB_CROAK)' >/dev/null 2>&1 || {
     skip_all='skipping gitweb tests, perl version is too old'
     test_done
 }
-- 
1.7.3.1.209.g52408