test: make FILEMODE a lazy prereq

This way, test authors don't need to remember to source
lib-prereq-FILEMODE.sh before using the FILEMODE prereq to guard tests
that rely on the executable bit being honored when checking out files.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3701-add-interactive.sh

@@ -2,7 +2,6 @@
 
 test_description='add -i basic tests'
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 if ! test_have_prereq PERL
 then

t/t4102-apply-rename.sh

@@ -7,7 +7,6 @@ test_description='git apply handling copy/rename patch.
 
 '
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 # setup
 

t/t4120-apply-popt.sh

@@ -6,7 +6,6 @@
 test_description='git apply -p handling.'
 
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 test_expect_success setup '
 	mkdir sub &&

t/t4129-apply-samemode.sh

@@ -3,7 +3,6 @@
 test_description='applying patch with mode bits'
 
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 test_expect_success setup '
 	echo original >file &&

t/t6031-merge-recursive.sh

@@ -2,7 +2,6 @@
 
 test_description='merge-recursive: handle file mode'
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 test_expect_success 'mode change in one branch: keep changed version' '
 	: >file1 &&

t/t9200-git-cvsexportcommit.sh

@@ -5,7 +5,6 @@
 test_description='Test export of commits to CVS'
 
 . ./test-lib.sh
-. "$TEST_DIRECTORY"/lib-prereq-FILEMODE.sh
 
 if ! test_have_prereq PERL; then
 	skip_all='skipping git cvsexportcommit tests, perl not available'

t/test-lib.sh

@@ -830,6 +830,10 @@ test_lazy_prereq SYMLINKS '
 	ln -s x y && test -h y
 '
 
+test_lazy_prereq FILEMODE '
+	test "$(git config --bool core.filemode)" = true
+'
+
 test_lazy_prereq CASE_INSENSITIVE_FS '
 	echo good >CamelCase &&
 	echo bad >camelcase &&