Update test to match Visual-Studio behaviour

Visual Studio only places files in a directory when the target name ends in a
slash or backslash. Also test the case of not using a slash.

Author: tautschnig

regression/goto-cl/Fo/Fo-directory.desc

@@ -1,6 +1,6 @@
 CORE
 
---verbosity 10 /c main1.c main2.c /Fo dir
+--verbosity 10 /c main1.c main2.c /Fo dir/
 ^EXIT=0$
 ^SIGNAL=0$
 --

regression/goto-cl/Fo/Fo-no-directory.desc

@@ -0,0 +1,9 @@
+CORE
+
+--verbosity 10 /c main1.c main2.c /Fo dir
+^EXIT=0$
+^SIGNAL=0$
+Output file \(executable\): dir.exe
+--
+^warning: ignoring
+^CONVERSION ERROR$