Add testcase/call_with_whitespace.mk

For 167e1f750dfed276d50ad93ebf0ce0a1f6e6f9ac
diff --git a/testcase/call_with_whitespace.mk b/testcase/call_with_whitespace.mk
new file mode 100644
index 0000000..f833b53
--- /dev/null
+++ b/testcase/call_with_whitespace.mk
@@ -0,0 +1,9 @@
+func = $(info called with '$(1)')
+test = $(call $(1),$(1))
+
+$(call test,func)
+$(call test, func)
+$(call test,func )
+$(call test, func )
+
+test: