cairo: modernize + add gtk-doc-stub build requirement

[madebr]

Specify library name and version: cairo/all

• Depends on gtk-doc-stub: add gtk-doc-stub/cci.20181216 recipe #7155 for gtkdocize

Fixes #7089

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• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[ghost]

I detected other pull requests that are modifying cairo/all recipe:

• Remove cairo dependence on which command and failing if gtkdocize isn't installed. #7027

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

All green in build 2 (37de05a084de0f2fd497b80fc27908520460a64c):

• cairo/1.17.4@:
  All packages built successfully! (All logs)

• cairo/1.16.0@:
  All packages built successfully! (All logs)

• cairo/1.17.2@:
  All packages built successfully! (All logs)

[SSE4]

most of the changes are changing double quotes to single quotes and vice versa