libkrb5: disable optional tcl support
Avoid detection of host tcl headers.
The tcl package in Buildroot is not cross-compile safe. The generated
tclConfig.sh script has -L/usr/lib in TCL_LIB_SPEC.
Should fix:
http://autobuild.buildroot.net/results/d11/
d118c3c09f6fc1de26491f2ed480ef28b091dba8/
http://autobuild.buildroot.net/results/035/
0353e1443125da1e544d1a98348716bfe67c8726/
Cc: André Hentschel <nerv@dawncrow.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>