Many of the external links found in the notmuch source can be resolved
using https instead of http. This changeset addresses as many as i
could find, without touching the e-mail corpus or expected outputs
found in tests.
This attribute is understood by gcc since version 2.5. clang provides
support for testing for function attributes using __has_attribute. For
other compilers this macro evaluates to the empty string.
Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>
__has_attribute is defined by clang and tests whether a given function
attribute is supported by clang.
Add a compatibility macro for other compilers.
Signed-off-by: Justus Winter <4winter@informatik.uni-hamburg.de>
