drivers: fix log type variables for -fno-common

drivers: fix log type variables for -fno-common

The zlib compression driver, as well as the aesni-gcm, aesni-mb and openssl
crypto drivers all defined the logtype variable in the header file
directly. This gives errors with gcc 10, due to -fno-common being the
default, so we need to apply the same fix in all cases:
* move the variable definition to a suitable .c file
* mark the forward declaration of the variable in the header as "extern"

Fixes: 0c4e4c16b004 ("compress/zlib: introduce zlib PMD")
Fixes: 90c8a2d02a31 ("crypto/aesni_gcm: add dynamic logging")
Fixes: 276624ae2ef6 ("crypto/aesni_mb: add dynamic logging")
Fixes: 094b2386f461 ("crypto/openssl: add dynamic logging")
Cc: stable@dpdk.org
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Lukasz Wojciechowski <l.wojciechow@partner.samsung.com>