Add test case for local labels that superficially look like keywords

test/asm/local-like-keyword.asm

@@ -0,0 +1,13 @@
+SECTION "test", ROM0
+
+Global: dw Global
+.ret dw .ret
+.xor: dw .xor
+Global.section: dw .section
+
+DEF n EQU 42
+.n: dw .n
+
+MACRO foo
+ENDM
+.foo: dw Global.foo