cmake: Fix install location of header files. Based upon patch by Uwe Bonnes
[libftdi] / src /
drwxr-xr-x   ..
-rw-r--r-- 1536 CMakeLists.txt
-rw-r--r-- 350 Makefile.am
-rw-r--r-- 84701 ftdi.c
-rw-r--r-- 16428 ftdi.h