wget: improve reproducibility

wget: improve reproducibility

Remove build host references from the internally
generated file version.c. The references get compiled into
executables, which leads to non-reproducible builds.
The removed references (--sysroot, -fdebug-prefix-map) were
only used as part of the `wget --version' which do not have
side effect.

(From OE-Core rev: c7fc89c136311c69bc96edf110e988f1be691781)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>