prosody: fix build with musl libc
musl libc does not provide the mallinfo() API. Define WITHOUT_MALLINFO
to skip the code using it.
Fixes:
http://autobuild.buildroot.net/results/42c/
42cd6e3be761d1cb358bc50acd7fa58c8aa1c750/
http://autobuild.buildroot.net/results/29d/
29d8dcbe013e549a865c0c5953272dab1fe5f777/
http://autobuild.buildroot.net/results/a6d/
a6deb7440f80b072432c0f9c048e59abe4edf1c0/
Cc: Dushara Jayasinghe <[email protected]>
Cc: Francois Perrad <[email protected]>
Signed-off-by: Baruch Siach <[email protected]>
Signed-off-by: Peter Korsgaard <[email protected]>