Fixes passthrough with environment variable.

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>

dlsym() calls calloc(), so let's use a temporary version. This is only
used for resolving symbol 'calloc' for passthrough.

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>

Read profiles in sequence. $profile means either 'app.profile' or if
that's not found, 'default.profile'.

1. /usr/lib/libaslrmalloc/profile/$profile (distro)
2. /etc/libaslrmalloc/profile/$profile (local admin overriding the distro)
3.  ~/.config/libaslrmalloc/profile/$profile (user permanently overriding
    the admin, when allowed (not for SUID)),
    either with $XDG_CONFIG_HOME or $HOME/.config (without $XDG_CONFIG_HOME)
4.  environment (user temporarily overriding 3., when allowed (not for SUID))

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>