configure: fix for missing include files on Linux

configure: fix for missing include files on Linux

By merging [1] and [2], the drivers 'xlnx-pcie-xvc' and 'linuxspidev'
are now build by default on Linux.
This highlights the dependency of some include files under subfolder
'linux' that are not installed by default in all Linux boxes.

Add the check in 'configure' for the presence of the include file
and conditionally enable the build of the driver.

Change-Id: Ie88645c3455ab07622f069a0cc7bf09d1a5a2c75
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Link: [1] 7214c8be46f7 ("configure: show adapter Xilinx XVC/PCIe in the configuration summary")
Link: [2] 83e0293f7ba3 ("Add Linux SPI device SWD adapter support")
Reviewed-on: https://review.openocd.org/c/openocd/+/8935
Tested-by: jenkins