Add ability to disable verbose strings in curl

[exief]

Currently within curl there exists 2 parameters verbose debug and verbose strings. On unix systems with autotools disabling verbose debug will disable both however on windows systems these are semantically different. This change allows the option when configuring with cmake to selectively disable one, the other or both

• 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 libcurl/all recipe:

• libcurl: CMake build fix on with_threaded_resolver option #11036

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 5 (75515644900ccb835d33a8d90edbc41a18f9156e):

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