build: speed up kernel symbol export stripping

GNU grep has a high per-expression setup overhead when compiling regular
expressions. Use -F to force it to interpret the input as fixed strings,
which is much faster (fraction of a second instead of multiple minutes).

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 39049
This commit is contained in:
Felix Fietkau 2013-12-14 13:14:44 +00:00
parent 6cb542d6a4
commit 5a6a47e431