MinGW tests: override 'pwd', too

With MinGW based Git, we must not use the POSIXified version of paths.
So we need to use 'pwd -W' instead of 'pwd' without options.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

t/t5505-remote.sh

@@ -107,9 +107,6 @@ test_expect_success 'remove remote' '
 )
 '
 
-case $(uname -s) in
-*MINGW*) pwd() { builtin pwd -W; } ;;
-esac
 cat > test/expect << EOF
 * remote origin
   URL: $(pwd)/one

t/test-lib.sh

@@ -536,5 +536,8 @@ case $(uname -s) in
 	find () {
 		/usr/bin/find "$@"
 	}
+	pwd() {
+		builtin pwd -W
+	}
 	;;
 esac