Make bench file not need by pecl package

[cataphract]

Fixes failures like this in dd-trace-php: https://app.circleci.com/pipelines/github/DataDog/dd-trace-php/16600/workflows/31d2931c-8a5b-449c-bc12-d911585b2ddb/jobs/4698215

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.63%. Comparing base (d351d66) to head (0d023f3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #530      +/-   ##
==========================================
+ Coverage   70.58%   70.63%   +0.04%     
==========================================
  Files         206      206              
  Lines       28129    28112      -17     
==========================================
  Hits        19856    19856              
+ Misses       8273     8256      -17     

Components	Coverage Δ
crashtracker	16.52% <ø> (ø)
datadog-alloc	98.73% <ø> (ø)
data-pipeline	50.00% <ø> (ø)
data-pipeline-ffi	0.00% <ø> (ø)
ddcommon	86.43% <ø> (ø)
ddcommon-ffi	75.29% <ø> (ø)
ddtelemetry	58.95% <ø> (ø)
ipc	84.13% <ø> (ø)
profiling	78.78% <ø> (ø)
profiling-ffi	58.64% <ø> (ø)
serverless	0.00% <ø> (ø)
sidecar	35.42% <ø> (ø)
sidecar-ffi	0.00% <ø> (ø)
spawn-worker	54.98% <ø> (ø)
trace-mini-agent	71.14% <ø> (ø)
trace-normalization	98.24% <ø> (ø)
trace-obfuscation	95.73% <ø> (ø)
trace-protobuf	77.16% <ø> (ø)
trace-utils	91.63% <ø> (+0.59%)	⬆️

[pr-commenter]

Benchmarks

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[bwoebi]

Thanks!