Asan: Disable for CentOS7 because LD_PRELOAD issue.

[winlinvip]

Description

For CentOS7, we got error as bellow, see google/sanitizers#796 for detail:

==48458==ASan runtime does not come first in initial library list; you should either link runtime to your application or manually preload it with LD_PRELOAD.

1. SRS Version: 5.0.119

2. SRS Log:

==48458==ASan runtime does not come first in initial library list; you should either link 
runtime to your application or manually preload it with LD_PRELOAD.

3. SRS Config:

./objs/srs -c conf/srs.conf

Replay

CentOS 7.

Step 1: Link asan by shared library.

./configure --sanitizer=on --sanitizer-static=off && make

Step 2: Run SRS

./objs/srs -c conf/srs.conf

#==48458==ASan runtime does not come first in initial library list; you should either link 
# runtime to your application or manually preload it with LD_PRELOAD.

There is a workaround:

env LD_PRELOAD=/lib64/libasan.so.5 ./objs/srs -c conf/srs.conf