Added a number of convenience Makefiles.

src/stub/src/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C .. $@

src/stub/src/arch/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../.. $@

src/stub/src/arch/amd64/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/arm/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/arm/v4a/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../../.. $@

src/stub/src/arch/arm/v4t/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../../.. $@

src/stub/src/arch/i086/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/i386/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/m68k/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/mips/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/arch/mips/mipsel.r3000/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../../.. $@

src/stub/src/arch/powerpc/32/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../../.. $@

src/stub/src/arch/powerpc/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../../.. $@

src/stub/src/include/Makefile

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+# convenience Makefile
+default %:
+	$(MAKE) -C ../.. $@