[package] imagemagick/7.0.11-14: optional dependencies not found

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Package and Environment Details

• Package Name/Version: imagemagick/7.0.11-14
• Operating System+version: Linux Ubuntu 22.04
• Compiler+version: GCC 11
• Conan version: conan 1.52.0
• Python version: Python 3.10.4

Conan profile

[settings]
os=Linux
os_build=Linux
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.version=11
compiler.libcxx=libstdc++11
build_type=Release
[options]
[conf]
[build_requires]
[env]

Steps to reproduce

On a host with pkg-config NOT installed (in my case, a fresh ubuntu 22.04 with only build-essential, python3 and conan installed)

Try to install imagemagick:7.0.11-14 with webp support:

[requires]
imagemagick/7.0.11-14
[options]
imagemagick:with_webp=True
imagemagick:with_pango=False

(I disabled pango because it has other dependencies I don't won't to be bothered with)

conan will look for the libpng and libwebp packages:

Requirements
[...]
libpng/1.6.37 from 'conancenter' - Cache
[...]
libwebp/1.2.0 from 'conancenter' - Cache
[...]

We can see the .pc files for libpng and libwebp are created:

imagemagick/7.0.11-14: Generator pkg_config created libpng.pc
[...]
imagemagick/7.0.11-14: Generator pkg_config created libwebp.pc
imagemagick/7.0.11-14: Generator pkg_config created libwebpmux.pc
imagemagick/7.0.11-14: Generator pkg_config created libwebpdemux.pc
imagemagick/7.0.11-14: Generator pkg_config created libwebpdecoder.pc
imagemagick/7.0.11-14: Generator pkg_config created libwebp-all-do-not-use.pc

But in the configure steps of the build, these dependencies cannot be found:

checking for libpng >= 1.0.0... no
checking for libwebp >= 0.4.1... no
checking for libwebpmux >= 0.5.0 libwebpdemux >= 0.5.0... no

This is because pkg-config is not installed so the configure script cannot use it (as everything works if pkg-config is installed via apt)
I solved this by adding pkgconf/1.7.4 as a build requirement in the imagemagick package. I this is the right fix, I can provide a PR..

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