treewide: drop nanosleep patches related to uClibc-ng

treewide: drop nanosleep patches related to uClibc-ng

These all patches were related to uClibc-ng
according to this commit [1]. uClibc-ng was
removed in OpenWrt main repo, so these patches
are not needed anymore. They could not be even
applied by `git am`, so there is difficult to find
who authored it, if it was upstreamed (most likely not).

[1] c1a9e69feff5c879ddcdf476f59285b137c05ecd ("libreswan: Replace usleep with nanosleep")
[2] https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=63fb175203bbf3b336804587c2f5b3a2d8132ec1

Signed-off-by: Josef Schlehofer <[email protected]>