do not overwrite LD_PRELOAD variable

[zzh1996]

when I run the following command: LD_PRELOAD=a.so proxychains env what I get: LD_PRELOAD=libproxychains.so.3 what I expect: LD_PRELOAD=a.so libproxychains.so.3

[albertofwb]

I think you can modify the source code by adding an augument to control the program whether replacing the LD_PRELOAD or append to the LD_PRELOAD

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