Reported by seanm (github).
Fixes #111.

When converting `0x` the converter would assert (or access out of
    boundary).
With `0x1.p1234556666FFFFF` the converter would overflow and not yield
the correct exponent.

* minor bug fix: use free() instead of delete[] to free memory allocated by strdup()

* fix for uninitialized variable problem found by valgrind

* disable assertions for 'optimize' build

* removed -g option that was inadvertently added to CCFLAGS

* ignore generated files

64-bit libraries should be installed in /usr/lib64, not in /usr/lib/
Make the destination lib dir configurable.

Commit e13e72e1 removed
include(GNUInstallDirs) and ${CMAKE_INSTALL_LIBDIR} which broke
installing on 64-bit systems.

Signed-off-by: Jason Zaman <jason@perfinion.com>

This fixes compilation on such platforms.

Fixes #91.

Fixes #89.

Support emscripten

Fixes #62

More info about ARC architecture is here: [1] & [2].
We need ARC supported here for many things like:
 - ICU (see [3])
 - Qt5 etc

[1] https://www.synopsys.com/designware-ip/processor-solutions/arc-processors.html
[2] https://en.wikipedia.org/wiki/ARC_(processor)
[3] https://unicode-org.atlassian.net/browse/ICU-20155

Fixes #81

Large hex literals would lose their minus sign.

Fixes #49

Fixes #48.

This should make it easier to add new architectures.

Fixes #73.

Use `static_assert` with newer compilers.

Add Native Client as support architecture.

Fixes #67.

Fixes #66.

Avoid undefined cast to make ASAN happy.

Add `exports_files`

The LICENSE file wasn't exported.

* Clarify output charset in DoubleToAscii documentation

* Fixing typo in charset docs.