[FS#3525] ImageBuilder script can't detected installed Python3 on Arch linux

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Sinan Çetinkaya (sinancetinkaya) 

Attached to Project - OpenWrt/LEDE Project
Summary - ImageBuilder script can't detected installed Python3 on Arch linux
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - ImageBuilder script fails despite Python3 is installed. 
Tested on/with:
Snapshot: openwrt-imagebuilder-ramips-mt7621.Linux-x86_64 Mon Dec 21 09:11:07 2020
OS: Linux archlabs 5.9.11-arch2-1 #1 SMP PREEMPT Sat, 28 Nov 2020 02:07:22 +0000 x86_64 GNU/Linux

Checking 'getopt'... ok.
Checking 'stat'... ok.
Checking 'unzip'... ok.
Checking 'bzip2'... ok.
Checking 'wget'... ok.
Checking 'perl'... ok.
Checking 'python2-cleanup'... ok.
Checking 'python'... failed.
Checking 'python3'... failed.
Checking 'git'... ok.
Checking 'file'... ok.
Checking 'rsync'... ok.
Checking 'ldconfig-stub'... ok.

Build dependency: Please install Python >= 3.5
Build dependency: Please install Python >= 3.5

Prerequisite check failed. Use FORCE=1 to override.
make[1]: *** [Makefile:90: staging_dir/host/.prereq-build] Error 1
make: *** [Makefile:239: image] Error 2

sinan at archlabs ~/Desktop/openwrt/openwrt-imagebuilder-ramips-mt7621.Linux-x86_64
 % where python 
/usr/bin/python
/bin/python

sinan at archlabs ~/Desktop/openwrt/openwrt-imagebuilder-ramips-mt7621.Linux-x86_64
 % where python3
/usr/bin/python3
/bin/python3

sinan at archlabs ~/Desktop/openwrt/openwrt-imagebuilder-ramips-mt7621.Linux-x86_64
 % python3
Python 3.9.0 (default, Oct  7 2020, 23:09:01) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 


More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3525

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