libfslcodec: bump to version 4.0.7

Changelog since 4.0.3:
- Add mx7 SoC support.
- Add test binary to release package.
- Fix segmentation fault issue with only standard build.
- Build std only for arm11 and arm12.
- Fix some mp3_dec noise issue of c code for arm11 and arm9.

This patch is based on the Yocto equivalent:
https://github.com/Freescale/meta-fsl-arm/commit/47b2677
https://github.com/Freescale/meta-fsl-arm/commit/c88fd22
https://github.com/Freescale/meta-fsl-arm/commit/3220a4c

This package has been implicitely tested through gstreamer as the 0.10
plugin relies on it:
 # gst-launch-0.10 playbin uri=file:///root/tears_of_steel_1080p.webm



Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>