[gperf] remove explicit apple deployment target flag

[SSE4]

remove explicit tools.apple_deployment_target_flag

two reasons for the change:

1. since Autotools adds apple deployement target flag conan#7862, AutoToolsBuildEnvironment calls tools.apple_deployment_target_flag on its own
2. Feature: add os.sdk sub-settings for Apple conan#8263 adds os.sdk sub-setting, Feature: add Apple Catalyst support (as new os.subsystem) conan#8264 adds os.subsystem sub-setting, they need to be passed to the tools.apple_deployment_target_flag

Specify library name and version: gperf/all

• 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 gperf/all recipe:

• [gperf] Patch gperf to remove register storage classifier (deprecated in C++17) #3876

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 1 (b54671419a83180eb34b3035a3cf15ec07956987)! 😊

• gperf/3.1: Generated 3 packages. All logs here