a compile time print was added warning in case of 128bit ctr_drbg keys.
This was don't to avoid an actual warning in these cases
(making build with warnings as errors possible).
Additional warnings on the Changelog/headers were set to use the same phrasing
phrasing was approved by Gilles and Janos.

When the Doxywizzard GUI is used and the doxyfile is loaded, the
workind directory for doxygen is set to the location of the doxyfile.
However the Make and CMake build systems expect doxygen to be ran
from the top level directory.
This commit unifies the build system and the Doxywizzard GUI so that
all of them expect doxygen to be executed in the doxygen directory.

The main makefile check target does not depend on tests. When running
make with the -j option it could happen that the tests are build twice
and concurrently, which causes errors.

Modify the main Makefile so that post_build target is not started in
parallel with tests and programs recipe.

Postbuild step failed when building with mingw

If the option MBEDTLS_TEST_NULL_ENTROPY is enabled, the cmake generated
makefile will generate an error unless a UNSAFE_BUILD switch is also enabled.

Equally, a similar warning will always be generated if the Makefile is built,
and another warning is generated on every compilation of entropy.c.

This is to ensure the user is aware of what they're doing when they enable the
null entropy option.

This partially reverts 1989caf7 (only the changes to Makefile and
CMakeLists, the addition to scripts/config.pl is kept).

Modifying config.h in the apidoc target creates a race condition with

    make -j4 all apidoc

where some parts of the library, tests or programs could be built with the
wrong config.h, resulting in all kinds of (semi-random) errors. Recent
versions of CMake mitigate this by adding a .NOTPARALLEL target to the
generated Makefile, but people would still get errors with older CMake
versions that are still in use (eg in RHEL 5), and with plain make.

An additional issue is that, by failing to use cp -p, the apidoc target was
updating the timestamp on config.h, which seems to cause further build issues.

Let's get back to the previous, safe, situation. The improved apidoc building
will be resurrected in a script in the next commit.

fixes #390
fixes #391

Otherwise we get warnings that some documentation items don't have
corresponding #define, and more importantly the corresponding snippets are not
included in the output.

For that we need a modified version of the "full" argument for config.pl.

Also, the new CMakeLists.txt target only works on Unix (which was already the
case of the Makefile target). Hopefully this is not an issue as people are
unlikely to need that target on Windows.

closes #232

closes #223

ssl-opt.sh and compat.sh can now be run from root too

- works on Windows too!
- we need Perl to generate/build the test suites anyway
- easier & more flexible (eg, now count total number of tests run)

On first build, targets such as 'programs' already worked fine. By adding
'lib' as a dependency here, we make sure dependencies for the library are
checked first so that it is rebuild if necessary on subsequent builds.

For the sake of systems where we want gmake.

1. Use $(MAKE) -C

2. Use target dependencies instead of dups.
Signed-off-by: Alon Bar-Lev <alon.barlev@gmail.com>

The data produced by gcov for static inline functions is too unreliable to be
actually useful. Some lines that are covered are not marked as such, some
other static inline functions are completely ignored, and the reasons why do
not look obvious.