Some more file/path restructuring.

All #includes now explicitly use the "<libopencm3/stm32/rcc.h>" format.
If you want to get rid of the "libopencm3" prefix in your local project you
can add a respective -I entry in your Makefile (not recommended though).

All .ld files and .a libs are installed in $(TOOLCHAIN_DIR)/lib
directly (as before), but are now renamed to avoid potential
conflicts now or in the future. Examples:

  libopencm3_lpc13xx.a
  libopencm3_lpc13xx.ld
  libopencm3_stm32.a
  libopencm3_stm32.ld

examples/lpc13xx/Makefile.include

@@ -30,8 +30,7 @@ TOOLCHAIN_DIR   = ../../../..
 CFLAGS		+= -Os -g -Wall -Wextra -I$(TOOLCHAIN_DIR)/include -fno-common \
 		   -mcpu=cortex-m3 -mthumb
 LDSCRIPT	= $(BINARY).ld
-LDFLAGS         += -L$(TOOLCHAIN_DIR)/lib -L$(TOOLCHAIN_DIR)/lib/libopencm3 \
-		   -L$(TOOLCHAIN_DIR)/lib/lpc13xx \
+LDFLAGS         += -L$(TOOLCHAIN_DIR)/lib -L$(TOOLCHAIN_DIR)/lib/lpc13xx \
 		   -T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections
 OBJS		+= $(BINARY).o