ObjFW  All files named "src/exceptions/common.h"

This means that OFObject.h imports macros.h now, making it unnecessary
to manually import macros.h in almost every file. And while at it, also
import autorelease.h in OFObject.h, so that this doesn't need to be
manually imported in almost every file as well. file: [9631779c5c] check-in: [13ee56edf3] user: js, branch: trunk, size: 1507 [annotate] [blame] [check-ins using] [diff]

A lock for thread-unsafe getaddrinfo was missing and not all locks were
unlocked / all buffers free'd if an error occurred. file: [fcb5839156] check-in: [898f8c7072] user: js, branch: trunk, size: 1509 [annotate] [blame] [check-ins using] [diff]

Not using -std=gnu11 means _GNU_SOURCE does not get defined anymore,
therefore this commit also adds the required feature defines for glibc.

Additionally, this adds of_strdup in macros.h, as strdup is an
extension. file: [8eded04c5d] check-in: [2f5af58573] user: js, branch: trunk, size: 1531 [annotate] [blame] [check-ins using] [diff]

This mostly removes the argument for the class in which the exception
occurred. As backtraces were recently added for all platforms, the
passed class does not give any extra information on where the exception
occurred anymore.

This also removes a few other arguments which were not too helpful. In
the past, the idea was to pass as many arguments as possible so that it
is easier to find the origin of the exception. However, as backtraces
are a much better way to find the origin, those are not useful anymore
and just make the exception more cumbersome to use. The rule is now to
only pass arguments that might help in recovering from the exception or
provide information that is otherwise not easily accessible. file: [adaa2c4822] check-in: [3d16a30f41] user: js, branch: trunk, size: 1513 [annotate] [blame] [check-ins using] [diff]