[PHP] fix: split ABI syscall and residual runtime fixes

[brandonpayton]

Supersedes fork-headed PR #739. This replacement keeps the same head commit (771abb8) but moves the PR head onto an Automattic/kandelo branch.

Why this is needed

The remaining PHP PHPT failures exposed lower-level ABI and syscall compatibility gaps: wasm32 syscall signatures, musl fallback signatures, route netlink loopback enumeration, invalid lseek offset preservation, interrupted select, the times syscall, and dev-shell linkage for bzip2.

Why this shape makes sense

This is the residual ABI and syscall layer after the more focused socket, process, and host/browser stacks. Keeping it stacked last isolates the compatibility tail without mixing it back into the harness PR.

Why this is the correct fix

Each change brings Kandelo syscall or build/runtime contracts closer to what compiled Unix userland expects. That is preferable to skipping PHP tests that reveal genuine platform differences.

Stack

Base: integration/kd-6nz-php-phpt-host-browser-base, after the host/browser/SharedFS replacement layer.

Verification

Branch-location correction only. Replacement head SHA matches fork-headed PR #739 exactly.

[github-actions]

Phase B-1 matrix build status — pr-758-staging

ABI v16. 66 built, 1 failed, 67 total.

Package	Arch	Status	Sha
libcurl	wasm32	built	7681d83e
libcxx	wasm32	built	bc611e79
libcxx	wasm64	built	13b44e91
libiconv	wasm32	built	7ab27539
libiconv	wasm64	built	e93ae499
libpng	wasm32	built	6bc920a8
libxml2	wasm32	built	d4c9058c
libxml2	wasm64	built	5a1d8232
openssl	wasm32	built	aa079458
openssl	wasm64	built	854d0c55
sqlite	wasm32	built	3454b49c
sqlite	wasm64	built	8f9815d6
zlib	wasm32	built	6d8fb690
zlib	wasm64	built	f16d95d0
bc	wasm32	built	8b0c1643
bzip2	wasm32	built	1f6e2077
coreutils	wasm32	built	54a37d22
curl	wasm32	built	98ea65cc
dash	wasm32	built	74c03877
diffutils	wasm32	built	cb1a04a2
dinit	wasm32	built	57c118a9
fbdoom	wasm32	built	f4de8ba7
file	wasm32	built	0e4aa41d
findutils	wasm32	built	3cb34c0f
gawk	wasm32	built	bf2b2063
git	wasm32	built	715a3eb4
grep	wasm32	built	d827f874
gzip	wasm32	built	fe69834f
kandelo-sdk	wasm32	built	c1611bea
kernel	wasm32	failed	—
less	wasm32	built	726316e9
lsof	wasm32	built	e2e3144f
m4	wasm32	built	ca8b04d0
make	wasm32	built	16d8c49e
mariadb	wasm32	built	97f87d99
mariadb	wasm64	built	866f7f94
modeset	wasm32	built	da0bbc75
msmtpd	wasm32	built	4a1fcf42
nano	wasm32	built	8eb8257d
ncurses	wasm32	built	612fd198
netcat	wasm32	built	cb77d79c
nginx	wasm32	built	2ea21097
php	wasm32	built	2613d1bf
posix-utils-lite	wasm32	built	05879c12
sed	wasm32	built	6bcfa662
spidermonkey	wasm32	built	606e8208
tar	wasm32	built	c1c79aa1
tcl	wasm32	built	4a89bd4e
unzip	wasm32	built	04614a87
userspace	wasm32	built	b01e7798
vim	wasm32	built	e84c337f
wget	wasm32	built	220ffc60
xz	wasm32	built	000f3cb2
zip	wasm32	built	8336e9dc
zstd	wasm32	built	455fb39e
bash	wasm32	built	7f2c434e
mariadb-test	wasm32	built	3606a24a
mariadb-vfs	wasm32	built	a8127840
mariadb-vfs	wasm64	built	f6545787
nethack	wasm32	built	c149e580
node	wasm32	built	41ad042f
spidermonkey-node	wasm32	built	4a07ed07
vim-browser-bundle	wasm32	built	5147de2e
nethack-browser-bundle	wasm32	built	549dfd86
rootfs	wasm32	built	73f5971f
shell	wasm32	built	855fd738
node-vfs	wasm32	built	ed0025a6

_{Auto-generated; replaced on each push. Raw data in the publish-status workflow artifact.}