update for zstd support

# When you build LAMMPS with the COMPRESS package installed, it will

# use the 3 settings in this file.  They should be set as follows.

#

# The compress_SYSLIB setting is for linking the compression library.

# By default, the setting will point to zlib (-lz).

# The compress_SYSLIB setting is for linking the compression libraries.

# By default, the setting will point to zlib (-lz). For including

# Zstandard support add -DLAMMPS_ZSTD to compress_SYSINC and also

# add -lzstd to compress_SYSLIB to link to the library.

#

# The compress_SYSINC and compress_SYSPATH variables do not typically need

# to be set, as compression libraries are usually installed as packages

# in system locations. Otherwise, specify its directory via the

# compress_SYSPATH variable, e.g. -Ldir or compress_SYSINC variable( -Idir)

# The compress_SYSINC and compress_SYSPATH variables typically do not

# need any additional settings, as compression libraries are usually

# installed as packages in system locations. Otherwise, specify its

# library directory via the compress_SYSPATH variable, e.g. -Ldir or

# its include directory via the compress_SYSINC variable( -Idir)

# -----------------------------------------------------------

# Settings that the LAMMPS build will import when this package is installed

compress_SYSINC =

compress_SYSLIB = -lz

compress_SYSINC = # -DLAMMPS_ZSTD

compress_SYSLIB = -lz # -lzstd

compress_SYSPATH =