crda: fix static build failure

libnl-3 uses threads and this isn't accounted for in crda or
libnl-3*.pc files since crda doesn't use pkg-config.

Since linking order matters for static scenarios also throw in -lnl-3
into NLLIBS first since it gets appended to in crda makefiles to add
libnl-3.

libgcrypt depends on libgpg-error and this isn't accounted for in
crda makefile, but it is in libgcrypt-config script (in the correct
order for static linking), so set LDLIBS calling this script.

Fixes:
  http://autobuild.humanoidz.org/results/31c/31c54e16b60f41e2aa9ea6cd43ced694d3ce3ce0/
  http://autobuild.humanoidz.org/results/a45/a4548583aa63fbf6db9dbdf7e1556b0d23800de5/



Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>