Affacted the (automatic) download script for external modules:
./build_tools/download_externals

ASTERISK-27596

Change-Id: If4c3176f7bf58df32fec6e02a659f1a78d57cf4b

* Declare 'requires' and 'enhances' text fields on module info structure.
* Rename 'nonoptreq' to 'optional_modules'.
* Update doxygen comments.

Still need to investigate dependencies among modules I cannot compile.

Change-Id: I3ad9547a0a6442409ff4e352a6d897bef2cc04bf

ast_vector_string_split:
This function will add items to an ast_vector_string by splitting values
of a string buffer.  Items are appended to the vector in the order they
are found.

ast_vector_const_string:
A vector of 'const char *'.

Change-Id: I1bf02a1efeb2baeea11c59c557d39dd1197494d7

ASTERISK-27585

Change-Id: I27c67563788e6f67eeda5fb51a741823a50a95e2

We did this for TCP transports already but I'm not sure why we
didn't do it for TLS transports.

ASTERISK_27474 #not_final_fix

Change-Id: I5b1ef4b882f7b859e718236686b7898751dbb262

If any component of ast_config_AST_RECORDING_DIR is a symbolic link we
would incorrectly assume the ARI user was trying to escape the recording
path.  Create additional check to check the recording directory's
realpath, only deny access if both do not match.

This is needed by the testsuite when run by 'run-local'.

Change-Id: I9145e841865edadcb5f75cead3471ad06bbb56c0

ASTERISK-27575 #close

Change-Id: Ica3a522892afed7a96816a5ecf140e1671f46ad4

clang 5.0 warned about this.

ASTERISK-27576

Change-Id: If41f400a51973c06cdb9b75462e535b616bfe385

When an older GCC version is called with a too new warning option, GCC exited
with an error and Asterisk was not built. Therefore, the configure script tests
the installed compiler whether it supports that warning option. If not, Asterisk
does not pass it to the installed compiler. However, some compilers (like clang)
do not exit (error) but give just a warning in such a case. Because the compiler
did not exit, Asterisk passed the unknown-warning option.

ASTERISK-27560

Change-Id: Ia9d148e689c173df4e91699113605dab2de36038

GCC 7 warned about this.

ASTERISK-27578

Change-Id: I4a00458dbe9b575ef04338b6a7852272745e1552

clang 5.0 warned about this.

ASTERISK-27577

Change-Id: I898fe4255023138a9e8b579fe4482fcf582f2b78

ASTERISK-27555

Change-Id: I0818b6e42631be1b69237e2b41d3415275693e53

Before getting the file descriptor for an iostream check
that it is present.

ASTERISK-27534

Change-Id: Ie0aa1394007a37c30e337ea1176a6fb3a63bc99c

Debian packaging uses quilt to manage patches. Book-keeping for them is
done using quilt (either directly, or in a compatible format), and
tracked in the directory .pc .

Change-Id: I22c90f3d7ab8918e6216e7b686de6fa0e1fdaa7b
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

Change-Id: Ib11193531e797bcb16bba560a408eab155f706d1

Change-Id: Ic98a51f555062cd863b6db3f8d76065943a9dea3