t7005-editor.sh: Don't invoke real vi when it is in GIT_EXEC_PATH

The git wrapper executable always prepends the GIT_EXEC_PATH build
variable to the current PATH, so prepending "." to the PATH is not
enough to give precedence to the fake vi executable.

The --exec-path option allows to prepend a directory to PATH even before
GIT_EXEC_PATH (which is added anyway), so we can use that instead.
Signed-off-by: NBjörn Steinbrink <B.Steinbrink@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t7005-editor.sh

@@ -13,7 +13,6 @@ do
 done
 unset vi
 mv e-vi.sh vi
-PATH=".:$PATH"
 unset EDITOR VISUAL GIT_EDITOR
 
 test_expect_success setup '
@@ -59,7 +58,7 @@ do
 		;;
 	esac
 	test_expect_success "Using $i" '
-		git commit --amend &&
+		git --exec-path=. commit --amend &&
 		git show -s --pretty=oneline |
 		sed -e "s/^[0-9a-f]* //" >actual &&
 		diff actual expect
@@ -81,7 +80,7 @@ do
 		;;
 	esac
 	test_expect_success "Using $i (override)" '
-		git commit --amend &&
+		git --exec-path=. commit --amend &&
 		git show -s --pretty=oneline |
 		sed -e "s/^[0-9a-f]* //" >actual &&
 		diff actual expect