i2c-tools: fix static build

i2c-tools: fix static build

Add a patch to disable installation of dynamic library on static build.

Fixes:
http://autobuild.buildroot.net/results/2ba/2bab61f82fdab8fe7e13da61b7814a4c33501cd8/
http://autobuild.buildroot.net/results/284/28474ec930dc82fa504c57927e1f9bd994b2774a/
http://autobuild.buildroot.net/results/a1b/a1bf99467ad3661dcb3ede491a70a57f1f1e01b1/

Cc: Angelo Compagnucci <angelo.compagnucci@gmail.com>
Cc: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>