Currently, the process_pkgconfig() would process only the "Requires" key field 
and ignore "Requires.private" while generating the dev dependency chain.

Example: usr/lib/pkgconfig/libical.pc
----------
Libs: -L${libdir} -lical -licalss -licalvcal
Libs.private: -lpthread
Requires.private: icu-i18n
----------
Depends field generated for libical-dev
Depends: glib-2.0-dev, libical (= 3.0.7-r0)
------------

When trying to resolve the build time dependency with libical package using 
“-dev” ipk generated, it will throw the below error.
-----------
Package icu-i18n was not found in the pkg-config search path.
Perhaps you should add the directory containing `icu-i18n.pc'
to the PKG_CONFIG_PATH environment variable
Package 'icu-i18n', required by 'libical', not found
-----------

This patch will add the packages listed in "Requires.private" to the dependency 
chain.

-------
Depends field generated with this change for libical-dev
Depends: glib-2.0-dev, icu-dev, libical (= 3.0.7-r0)
-------

Other examples of packages generated with broken dev dependency.

libflac-dev : https://packages.debian.org/sid/libflac-dev
Without patch:
Depends: flac (= 1.3.3-r0), libflac, libflac++
with patch:
Depends: flac (= 1.3.3-r0), libflac, libflac++, libogg-dev

libglib2.0-dev : https://packages.debian.org/buster/libglib2.0-dev
without patch:
Depends: libffi-dev, libglib-2.0-0 (= 1:2.62.6-r0), libpcre-dev
with patch:
Depends: libffi-dev, libglib-2.0-0 (= 1:2.62.6-r0), libpcre-dev,
util-linux-dev, zlib-dev

Attachment: 0001-package.bbclass-Fix-broken-dev-package-dependency.patch
Description: Binary data

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