Fix eggdrop to compile and run under Haiku

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Fix eggdrop to compile and run under Haiku

Additional description (if needed):

1. Fix parse error before free_func
   zlib.h must be included after crypto.h
2. Fix Internal compiler error, output_operand_lossage invalid expression as operand
   Unwitched unnecessary pointer magick
3. Enable shared build by default for Haiku
4. Fix checking for a working resolver library
   Add check for -lnetwork
5. Fix coredns.c:154: field data has incomplete type
   data[] is struct hack (or c99 flexible array member)
   Haiku / gcc 2.95.3 complains but other systems may suffer also, esp. older systems, because the coredns.c struct hack code is "new" in eggdrop.
   This (5) bug is fixed with Fix struct hack / flexible array member #660.
6. Also update BUG-REPORT and COMPILE-GUIDE for Haiku

Please run misc/runautotools after merge.

Test cases demonstrating functionality (if applicable):

1. Tested unter Haiku R1 Alpha 4.1:

$ uname -a
Haiku shredder 1 hrevr1alpha4-44702 Nov 14 2012  BePC Haiku
$ gcc --version
2.95.3-haiku-121101

2. Tested unter Haiku R1 Beta 1:

$ uname -a
Haiku shredder 1 hrev52295+96 Sep 27 2018 18:48: x86_64 x86_64 Haiku
$ gcc --version
gcc version 7.3.0 (2018_05_01)

.status
[...]
OS: Haiku 1
[...]

[Cizzle]

Use "Tcl" and perhaps a ',' after "help".

[michaelortmann]

@Cizzle: done, ready for review again.

[Cizzle]

LGTM