failmalloc and main tests succesfully pass the test now.

Fix Windows build by defining `ssize_t` when missing and adjusting the
install commands.

Add support for ENABLE_WERROR=1 while at it.

Tested with MSVC 2013 on Windows 7 x64.

Avoid adding a LIBXML2_LIBRARIES-NOTFOUND to the libraries list when it
is not found. Likewise for OpenSSL.

Matches autotools behavior. The m4_if logic was misread...

Do not add _U_ and NGHTTP2_NORETURN definitions to the command line,
instead add it to config.h. This matches what autotools does.

Users can disable this by setting -DCMAKE_C_FLAGS=-DNDEBUG or
-DCMAKE_CXX_FLAGS=-DNDEBUG to disable assertions as desired.

Build type-specific flags are added before other flags, reflect this in
the output.

NOTE: RelWithDebInfo *disables* assertions by default. To keep
assertions, use CMAKE_BUILD_TYPE=Debug or CMAKE_BUILD_TYPE=None.

Add Nathan's PPA for cmake 3.2.3 (3.0 or newer is required).

Update to latest master with appropriate cmake changes at the same time.

Adds missing source files and configure.ac changes since
v1.7.0-93-g093eb51f.

Fixes and improvements for Makefile.MSVC

This change also fixes that bug that the multiple '/' at the start of
request were not coalesced into one.

Remove generated documentation, python and mruby build artifacts.
Note that this does not work for Ninja, Makefile works fine though.

Caught with cmake --warn-uninitialized.

Older automake (travis, *cough*) do not support the
AM_EXTRA_RECURSIVE_TARGETS option, this results in invoking "it-local"
directly in the travis script which relies on an implementation detail.

Since the "it" target is only used by the integration-tests directory,
just avoid the recursive targets. The README.rst suggests to enter the
integration-tests directory anyway.

The name passed to find_package should match the one that is passed to
find_package_handle_standard_args, otherwise the version matching is not
properly done. The names are based on the FindXXX.cmake filename.

This also simplifies components reporting for Libevent (done by
find_package_handle_standard_args) and results in reporting a library
instead of include directory when found.

libev 4.11 seems to build fine as demonstrated by Travis with autotools.

The COMPILE_LANGUAGE generator expression is only supported since CMake
3.3. Moreover, it does not work with all generators (works with Makefile
and Ninja, but not with Visual Studio).

target_compile_options would only work if a target does not mix C and
C++ sources, since the flags are intended to be set for a specific
language, use set_source_files_properties instead. This approach is also
less repetitive.

Drop the idea of using lists and COMPILE_OPTIONS,
set_source_files_properties only understands COMPILE_FLAGS (a single
string, not a list).

This change allows host pattern in --backend to include '*' to
indicate wildcard match.  The wildcard match is made in suffix match
only.