t0050: Set core.ignorecase case to activate case insensitivity

Case insensitive file handling is only active when
core.ignorecase = true.  Hence, we need to set it to give the tests
in t0050 a chance to succeed.  Setting core.ignorecase explicitly
allows to test some aspects of case handling even on case sensitive file
systems.

Signed-off-by: Steffen Prohaska <prohaska@zib.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t0050-filesystem.sh

@@ -50,6 +50,7 @@ fi
 
 test_expect_success "setup case tests" '
 
+	git config core.ignorecase true &&
 	touch camelcase &&
 	git add camelcase &&
 	git commit -m "initial" &&