Fix libwreport.pc dependencies

[edigiacomo]

See https://people.freedesktop.org/~dbn/pkg-config-guide.html#faq

wreport is compiled against the following libraries:

• lua: must be in Requires if lua support pkg-config else in Libs
• m: must be in Libs

[edigiacomo]

Moreover, Requires: lua >= 5.1.1 could be removed from RPM dependencies (because Lua supports pkg-config in RH-based distros).

[edigiacomo]

In-depth explanation following.

Tthe .pc file should observe with the following rule:

• A required library which supports pkg-config will be listed in Requires or Requires.private, with an optional comparison operator for the version.
• A required library which doesn't support pkg-config will be listed in Cflag + Libs or Libs.private.

See https://people.freedesktop.org/%7Edbn/pkg-config-guide.html#concepts

The .spec file should observe the following rules:

• A required library which supports pkg-config will be listed in BuildRequires as pkgconfig(NAME) with an optional comparison operator for the version (NAME is the name used in the Requires field of the .pc file). rpmbuild will automatically add the proper package to the dependencies of the -devel package.
• A required library which doesn't support pkg-config will be listed in BuildRequires using the name its -devel package and in Requires of the -devel package.

See https://fedoraproject.org/wiki/Packaging:PkgConfigBuildRequires and https://fedoraproject.org/wiki/Archives:PackagingDrafts/PkgconfigAutoRequires?rd=PackagingDrafts/PkgconfigAutoRequires

[edigiacomo]

• A required library which doesn't support pkg-config will be listed in BuildRequires using the name its -devel package and in Requires of the -devel package.

Moreover: the library will be in the Requires of the -devel package only if it's in Libs of the .pc file (i.e. not in Libs.private).