[core] update ls-hpack

LiteSpeed ls-hpack v2.3.1

[core] check ifndef NDEBUG before setting NDEBUG

[core] compiler workarounds for very old gcc,glibc

added in gcc 4.6:
#pragma GCC diagnostic push
#pragma GCC diagnostic pop
added in gcc 5 (?):
fix for error: #pragma GCC diagnostic not allowe

[core] compiler workarounds for very old gcc,glibc

added in gcc 4.6:
#pragma GCC diagnostic push
#pragma GCC diagnostic pop
added in gcc 5 (?):
fix for error: #pragma GCC diagnostic not allowed inside functions

x-ref:
https://redmine.lighttpd.net/boards/2/topics/10325

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[build] -Wno-implicit-fallthrough for ls-hpack

-Wno-implicit-fallthrough for ls-hpack on cygwin using recent gcc

[core] update ls-hpack

LiteSpeed ls-hpack v2.3.0

[core] STAILQ_* -> SIMPLEQ_* on OpenBSD

(thx brad)

[core] silence coverity warnings (another try)

[core] silence coverity warnings (another try)

[core] silence coverity warnings in ls-hpack

The code originates from https://github.com/litespeedtech/ls-hpack
and is explicitly documented as not needing to be initialized.

x-ref:
https://githu

[core] silence coverity warnings in ls-hpack

The code originates from https://github.com/litespeedtech/ls-hpack
and is explicitly documented as not needing to be initialized.

x-ref:
https://github.com/litespeedtech/ls-hpack/commit/634c69215f8646653bb4cb5cf448fb943008529f
https://github.com/litespeedtech/ls-hpack/commit/d92883ca10f458b76168eee980f2ccb776917ad3

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[core] skip ls-hpack decode work unused by lighttpd

define LSHPACK_DEC_CALC_HASH 0 to skip work whose results are not used
by lighttpd

[build] remove ls-hpack/deps

xxHash is provided separately by lighttpd src/algo_xxhash.[ch]

[build] modify build, includes for xxHash v0.8.0

[core] ls-hpack optimizations

define LSHPACK_DEC_HTTP1X_OUTPUT 0
lighttpd does not require HTTP/1.1 output compat from HPACK decoder
("field-name: value\r\n")

define NDEBUG (in ls-hpack/lshpack

[core] ls-hpack optimizations

define LSHPACK_DEC_HTTP1X_OUTPUT 0
lighttpd does not require HTTP/1.1 output compat from HPACK decoder
("field-name: value\r\n")

define NDEBUG (in ls-hpack/lshpack.c)
lighttpd spends upwards of 20% total lighttpd CPU time in HPACK
encode/decode in h2load test on static file over cleartext (not TLS)
Defining NDEBUG eliminates some asserts() and results in a small
but measurable reduction in CPU usage

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[core] comment possible future ls-hpack optimize

[core] link in ls-hpack (EXPERIMENTAL)

LiteSpeed ls-hpack v2.2.1

XXX: might be better to include this as a git submodule
but minor code changes were made here for portability:
- C99 flexible array

[core] link in ls-hpack (EXPERIMENTAL)

LiteSpeed ls-hpack v2.2.1

XXX: might be better to include this as a git submodule
but minor code changes were made here for portability:
- C99 flexible array members defined as a[] instead of a[0])
- pedantic compiler warnings (excess ';' and missing declarations)
- deletion of large tables from ls-hpack/huff-tables.h (code size)

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