build(trtexec_vendor): fix cmake to find trtexec bin

[felixf4xu]

Description

This pr fixes #5453

Tests performed

cmake build of trtexec_vendor

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[wep21]

LGTM

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (765a596) 15.32% compared to head (fffcc61) 15.32%.
Report is 98 commits behind head on main.

❗ Current head fffcc61 differs from pull request most recent head 9ae9d03. Consider uploading reports for the commit 9ae9d03 to get more accurate results

Files	Patch %	Lines
...rivable_area_expansion/drivable_area_expansion.cpp	40.00%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5464      +/-   ##
==========================================
- Coverage   15.32%   15.32%   -0.01%     
==========================================
  Files        1721     1721              
  Lines      118559   118561       +2     
  Branches    37995    37999       +4     
==========================================
- Hits        18169    18168       -1     
  Misses      79657    79657              
- Partials    20733    20736       +3     

Flag	Coverage Δ		*Carryforward flag
differential	∅ <ø> (?)
total	15.32% <40.00%> (-0.01%)	⬇️	Carriedforward from b6eee13

*This pull request uses carry forward flags. Click here to find out more.

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[wep21]

Internet access is disable during build process in github actions due to this PR.

[wep21]

The package was removed by this PR.