make: detect their module name automatically

For many modules the `Makefile` contains a line like
```
MODULE:=$(shell basename $(CURDIR))
```
This conclusively shows that we do not have to set the module name
manually.

This PR removes the need to set the module name manually, if it is the
same as the basename. E.g. for `…/sys/vtimer/Makefile` the variable
make `MODULE` will still be `vtimer`, because it is the basename of the
Makefile.

Makefile.base

@@ -2,6 +2,8 @@ ifeq (, $(__RIOTBUILD_FLAG))
     $(error You cannot build a module on its own. Use "make" in your application's directory instead.)
 endif
 
+MODULE ?= $(shell basename $(CURDIR))
+
 ASMSRC = $(wildcard *.s)
 ASSMSRC = $(wildcard *.S)
 ASMOBJ = $(ASMSRC:%.s=$(BINDIR)$(MODULE)/%.o)

core/Makefile

-MODULE =core
-
 include $(RIOTBASE)/Makefile.base

cpu/arm_common/Makefile

-MODULE =arm_common
-
 CFLAGS += $(CFLAGS_BASIC)
 include $(RIOTBASE)/Makefile.base

cpu/cortex-m3_common/Makefile

-
-# define the module that is build
-MODULE = cortex-m3_common
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc2387/gpioint/Makefile

-MODULE =gpioint
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc2387/i2c/Makefile

-MODULE =i2c
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc2387/mci/Makefile

-MODULE =mci
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc2387/rtc/Makefile

-MODULE =rtc
-
 include $(RIOTBASE)/Makefile.base

cpu/lpc_common/Makefile

-MODULE =lpc_common
-
 include $(RIOTBASE)/Makefile.base

cpu/native/rtc/Makefile

-MODULE =rtc
-
 include $(RIOTBASE)/Makefile.base
 
 $(BINDIR)$(MODULE)/%.o: %.c

cpu/sam3x8e/periph/Makefile

-
-MODULE = periph
-
 include $(RIOTBASE)/Makefile.base

drivers/Makefile

-MODULE = drivers
-
 DIRS=
 ifneq (,$(filter powermon,$(USEMODULE)))
     DIRS += powermon

drivers/at86rf231/Makefile

-MODULE =at86rf231
-
 include $(RIOTBASE)/Makefile.base

drivers/cc110x/Makefile

-MODULE =cc110x
-
 include $(RIOTBASE)/Makefile.base

drivers/cc110x_ng/Makefile

-MODULE =cc110x_ng
-
 DIRS =
 ifneq (,$(filter msb-430h,$(BOARD)))
 	DIRS += spi

drivers/cc2420/Makefile

-MODULE =cc2420
-
 include $(RIOTBASE)/Makefile.base

drivers/lm75a/Makefile

-MODULE =lm75a
 include $(RIOTBASE)/Makefile.base

drivers/ltc4150/Makefile

-MODULE =ltc4150
 include $(RIOTBASE)/Makefile.base

drivers/sht11/Makefile

-MODULE =sht11
 include $(RIOTBASE)/Makefile.base

drivers/srf02/Makefile

-MODULE =srf02
 include $(RIOTBASE)/Makefile.base