Fixes: b8b97209 stm32l4: basic uart/exti/led/clock demo
which introduced the l4 example, but left out the makefile.include file
and didn't add it to the root build.
Reported at: 2a7e4fac14
We already have "make examples" and "make lib" but make clean cleans
everything. Not super useful for end users, but rather handy for people
working on the examples.
The UART's baud rate is calculated using the current clock
configuration from the clock module. This example makes use
of the standard C library and writes the characters to the
UART in blocking mode.
User can specify which binaries he needs on the commandline.
'make hex' will build examples with generating hex file
'make hex bin' will build hex and bin output
'make images' will build all images as in previous versions of buildsystem
'make all' or 'make' will build only elf (+ map) files
This will have huge impact on build speed.
We merged a huge patchset for lpc43xx that breaks the examples. As we
are waiting for those to be updated it is better to disable the
automatic build of them.
