Python not found by build script on Ubuntu 20.04

[umanwizard]

Read the FAQ first: https://github.com/edenhill/librdkafka/wiki/FAQ

Description

In Ubuntu 20.04, there is no binary on the path called python. There is, however, python3, python2.7, and python2. Thus, the build script is not able to find python.

How to reproduce

~/c/librdkafka ❯❯❯ ./configure | grep python
checking for python (by command)... failed (disable)
disabling linker-script since python is not available

Checklist

IMPORTANT: We will close issues where the checklist has not been completed.

Please provide the following information:

• librdkafka version (release number or git tag): ` git 3c8cc41
• Apache Kafka version: N/A
• librdkafka client configuration: N/A
• Operating system: Ubuntu 20.04
• Provide logs (with debug=.. as necessary) from librdkafka: N/A
• Provide broker log excerpts: N/A
• Critical issue

[edenhill]

Will be fixed in v1.5.0

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