[riot-notifications] [RIOT-OS/RIOT] Remove newlib dep lpc2387 (#10746)

Kaspar Schleiser notifications at github.com
Thu Jan 10 12:24:42 CET 2019

### Contribution description

Currently, the boot code on lpc2387 hard-codes the use of ```printf()``` and uses ```exit()```, both inducing a dependency to libc.

This PR replaces ```printf()``` with ```LOG_ERROR()``` and ```exit(1)``` with an endless loop.

### Testing procedure

Run basic tests on lpc2387.

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cpu: lpc2387: turn printf -> LOG_ERROR
  * cpu: lpc2387: use while(1){} instead of exit

-- File Changes --

    M cpu/arm7_common/bootloader.c (20)

-- Patch Links --


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