The --install-deps mode doesn't actually install libsasl2 headers on CentOS 7

[lpulley]

Description

./configure --install-deps on a yum system doesn't actually install libsasl2 headers:

checking for libsasl2 (by pkg-config)... failed
checking for libsasl2 (by compile)... failed
installing dependencies (yum install -y cyrus-sasl) libsasl2... using yum
checking for libsasl2 (by pkg-config)... failed
checking for libsasl2 (by compile)... failed (fail)

Installing cyrus-sasl-devel fixes this (yum install cyrus-sasl-devel):

checking for libsasl2 (by pkg-config)... ok

If I understand this correctly, it's a simple fix:

https://github.com/confluentinc/librdkafka/blob/v2.6.1/mklove/modules/configure.libsasl2#L25

How to reproduce

I encountered this when running ./configure --install-deps on the Docker image quay.io/pypa/manylinux2014_x86_64 (ID 31712ce0fffd) with the v2.6.1 release archive.

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): v2.6.1
• Apache Kafka version: N/A
• librdkafka client configuration: N/A
• Operating system: CentOS 7 (x64)
• Provide logs (with debug=.. as necessary) from librdkafka (N/A)
• Provide broker log excerpts (N/A)
• Critical issue