The AIX operating system by IBM does not provide the getifaddrs function
and requires a custom linker script syntax. This commit allows for a
basic GCC build on AIX 7.2.
The build was tested using the command lines
make CC=gcc WITH_CJSON=no WITH_DOCS=no WITH_STATIC_LIBRARIES=yes
and
CC=gcc cmake <srcpath> -DDOCUMENTATION=no
At this point, the persistence test suite seems to fail. The library, as
well as the mosquitto_sub and mosquitto_pub executables were tested and
appear to be functional.
Signed-off-by: Andreas Kempf <aakempf@gmail.com>