Replace obsolete gethostbyname by getaddrinfo

Fix for MINGW builds

Only define _XOPEN_SOURCE on Linux.

Fixes the build on NetBSD.

The comment says it's only needed on Linux, and AFAIK Linux
is the only operating system that only adds symbols when it's defined;
others, like NetBSD or Solaris, also hide symbols.
Signed-off-by: Thomas Klausner <wiz@NetBSD.org>

Replaced tabs with spaces.

This also protect against the latest glibc bug

Update Makefile

Fixing typo in 'clean' section

Typo

64-bit length fields on ARM don't work

mongoose.c: using application/javascript for .js

As of http://www.rfc-editor.org/rfc/rfc4329.txt, the preferred MIME type
for JavaScript is application/javascript.

ARM only allows aligned accesses.  GCC generated unaligned accesses for the copy buffer, but ARM forces alignment, causing the first two bytes to be trampled.  I changed the mechanism to create two temporaries and memcpy them in.  It now works on ARM (and x86) for large websocket chunks.

Update ReleaseNotes.md(spell mistake)

spell mistake