UZLIB_CONF_USE_MEMCPY option bug

[udovichenkoAlexander]

memcpy cannot be used, because memory region may overlap (the behavior is undefined). copy must be made byte by byte.

Simple check with tgunzip:

1. set UZLIB_CONF_USE_MEMCPY to 1
2. set OUT_CHUNK_SIZE to 1024
3. do not use ring buffer
4. try decopress simple text file (12341234123411111113333333). I attach test.gz
5. tgunzip return Error during decompression: -4 (TINF_CHKSUM_ERROR)

test.txt
test.gz

[pfalcon]

Thanks for the report and testcase. Apparently, needs to be replaced by memmove(). Sadly, I don't have enough resource to work on the project now, so that will have to wait.