RIOT-OS/RIOT — pull request #1970 by Kijewski (2014-11-07 20:18:19+00:00)
Title: core: inline `cib.c`

The functions in `cib.h` are only used in `msg.c`. They are very small,
and proper function calls have a bigger overhead than inlining these
functions.

The difference in .text size (worst to best):

```
+104 native
+69 qemu-i386
+32 mbed_lpc1768
+28 samr21-xpro

-54 chronos
-54 z1
-56 iot-lab_M3
-56 msb-430
-56 msb-430h
-56 msba2
-56 openmote
-56 spark-core
-56 telosb
-56 wsn430-v1_3b
-56 wsn430-v1_4
-58 arduino-mega2560
-60 airfy-beacon
-60 arduino-due
-60 f4vi1
-60 msbiot
-60 pca10000
-60 pca10005
-60 stm32f0discovery
-60 stm32f3discovery
-60 stm32f4discovery
-60 udoo
-60 yunjia-nrf51822
-72 avsextrem
-72 pttu
-120 redbee-econotag
```