nspr: improve reproducibility
Remove _BUILD_STRING and _BUILD_TIME in _pl_bld.h
to avoid introducing timestamp in the .so library
such as libnspr4.so as below:
$ readelf --wide --decompress --hex-dump=.rodata libnspr4.so
[snip]
0x00004000
32303138 2d31312d 31352030 353a3439 2018-11-15 05:49
[snip]
[YOCTO #12639]
(From OE-Core rev:
a3ca6272845c33f48430210470f133034ad8399d)
Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
