Fix out of sources tree build

[remicollet]

Broken by eb9a16e and 03b2639

Notice: pecl build use out of sources tree build

So tagged version 5.1.2 will be unusable there

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2dcfef9) 72.95% compared to head (7df66e1) 72.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5239      +/-   ##
==========================================
+ Coverage   72.95%   72.96%   +0.01%     
==========================================
  Files          69       69              
  Lines       14858    14858              
==========================================
+ Hits        10839    10841       +2     
+ Misses       4019     4017       -2     

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[remicollet]

Notice: It will be nice to use some out of sources tree build in CI

phpize
mkdir cibuild
cd bibuild
../configure
make

[remicollet]

Notice, pecl-install.sh is not enough

See https://github.com/swoole/swoole-src/actions/runs/7635384707/job/20800724466
Some file (ex php_swoole_cxx) are not build.

Yes, the extension is built, but with mising sources it is unusable

Ex:

$  /usr/bin/php --no-php-ini -d extension=curl -d extension=sockets -d extension=mysqlnd -d extension=pdo --define extension=/dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so --modules

Warning: PHP Startup: Unable to load dynamic library '/dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so'
  (tried: /dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so
  (/dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so: undefined
  symbol: sw_zend_known_strings),
  /usr/lib64/php/modules//dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so.so
  (/usr/lib64/php/modules//dev/shm/BUILDROOT/php-pecl-swoole5-5.1.2-1.fc39.remi.8.2.x86_64/usr/lib64/php/modules/swoole.so.so:
  cannot open shared object file: No such file or directory)) in Unknown on line 0

So, adding such a minimal load test may be useful too.

[remicollet]

So, adding such a minimal load test may be useful too.

Second commit add such a test

P.S. Notice, the check will work fully when PHP is built using --enable-rtld-now