package/quickjs: installs at /usr/local instead of /usr

Check-list

• I did not find the issue in the existing issues
• I can reproduce the issue with unmodified Buildroot from this repository, not from a fork somewhere else
• I can reproduce the issue on the latest commit of the branch I'm using:
  • master
• I can reproduce the issue after running make clean; make

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What happens

Package quickjs installs the binaries inside /usr/local

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What was expected

Binaries by quickjs (qjs or qjc) are expected to be available at /usr/bin instead of /usr/local/bin

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Extra information

quickjs buildscript define the prefix=/usr while Makefile from source expect PREFIX=/usr