python-nose: drop obsolete bbappend

Due to the recent commit 6eddc9e2@openembedded-core [1], which
updated python-nose from 1.2.1 to 1.3.6, the bbappend for
python-nose 1.2.1 leads to an error during parsing. Instead of
making the bbappend version-independent, this commit simply drops
the bbappend file, as python-nose is provided as native package
already since 78711c88@openembedded-core [2] (since January 2014).

[1] https://github.com/openembedded/openembedded-core/commit/6eddc9e222077e50d5b1b2b827840ada3be1d978
[2] https://github.com/openembedded/openembedded-core/commit/78711c887520c88d733182a80edac49650a7e94f



Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

recipes-devtools/python/python-nose_1.2.1.bbappend

-BBCLASSEXTEND = "native"