[Pianod] Build 111 - user persistence changes

[Peter Li]

Hey, I'm having some minor build issues with v111 on Fedora x86, 
Raspbian, and ArchLinARM.

First, libezxml doesn't build from the makefile:

    c99 -O2 -DNDEBUG   -I src/libpiano -I src/libwaitress \
             -I src/libfootball -I src/libezxml \
             -DFB_NOIP6 \
             -I /opt/local/include -DENABLE_FAAD \
             -DENABLE_MAD  \
              -I/usr/include/json   -c -o src/libezxml/ezxml.o
    src/libezxml/ezxml.c
    src/libezxml/ezxml.c: In function 'ezxml_proc_inst':
    src/libezxml/ezxml.c:307:9: warning: implicit declaration of
    function 'strdup' [-Wimplicit-function-declaration]
    src/libezxml/ezxml.c:307:24: warning: assignment makes pointer from
    integer without a cast [enabled by default]
    src/libezxml/ezxml.c: In function 'ezxml_parse_fd':
    src/libezxml/ezxml.c:640:9: warning: implicit declaration of
    function 'madvise' [-Wimplicit-function-declaration]
    src/libezxml/ezxml.c:640:23: error: 'MADV_SEQUENTIAL' undeclared
    (first use in this function)
    src/libezxml/ezxml.c:640:23: note: each undeclared identifier is
    reported only once for each function it appears in
    src/libezxml/ezxml.c:642:35: error: 'MADV_NORMAL' undeclared (first
    use in this function)
    src/libezxml/ezxml.c: In function 'ezxml_set_attr':
    src/libezxml/ezxml.c:928:26: warning: assignment makes pointer from
    integer without a cast [enabled by default]
    make: *** [src/libezxml/ezxml.o] Error 1

I can just go to the libezxml directory and run make in place there and 
it generates a static archive successfully and then the rest of pianod 
build seems to go on.

But then at the end of pianod build I have:

       LINK  pianod
    c99 -O2 -DNDEBUG   -L/opt/local/lib  src/pianod.o src/player.o
    src/command.o src/settings.o src/support.o src/response.o
    src/logging.o src/users.o src/seeds.o src/query.o src/pianoextra.o
    src/libpiano/crypt.o src/libpiano/piano.o src/libpiano/request.o
    src/libpiano/response.o src/libfootball/fb_event.o
    src/libfootball/fb_parser.o src/libfootball/fb_service.o
    src/libfootball/fb_socketmgr.o src/libezxml/ezxml.o \
             src/libwaitress/waitress.o -lao -lpthread -lm \
             -lfaad -lbsd -lmad -lgnutls \
             -lgcrypt -ljson   -o pianod
    src/users.o: In function `encrypt_password':
    users.c:(.text+0x278): undefined reference to `crypt'
    src/users.o: In function `authenticate_user':
    users.c:(.text+0x5b0): undefined reference to `crypt'
    collect2: error: ld returned 1 exit status
    make: *** [pianod] Error 1

Kind of funny since it doesn't complain at compile time and it doesn't 
have trouble finding gcrypt.  Maybe it's a gcrypt version issue?  It 
does build if I replace calls to crypt with PianoEncryptString, but I 
haven't had a chance to see whether that works or is completely wrong :).

Probably should have sent this last night to take advantage of 
timezones...  Will post back if I figure it out.
Best,
P
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