[gpref] bump to latest master to support C++17

[prince-chrismc]

Specify library name and version: lib/1.0

• 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.

[conan-center-bot]

Some configurations of 'gperf/cci.20201208' failed in build 1 (7db75d2516af72b084db142b6375d505eadd57df):

• Macos x86_64, Release, apple-clang 9.1, libc++
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[prince-chrismc]

gperf/cci.20201208: WARN: Build folder is dirty, removing it: /Users/jenkins/w/cci_PR-4332/.conan/data/gperf/cci.20201208///build/46f53f156846659bf39ad6675fa0ee8156e859fe
ERROR: gperf/cci.20201208: Error in source() method, line 29
tools.get(**self.conan_data["sources"][self.version])
ConanException: Cannot deduce file name from the url: 'https://git.savannah.gnu.org/gitweb/?p=gperf.git;a=snapshot;h=556e87b5c52b0c03a1e7418f45225a9b664f83c5;sf=tgz'. Use 'filename' parameter.

The HTTP response include the filename.... why is it parsed from the URL?

[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]

Some configurations of 'gperf/3.1' failed in build 2 (6a0f14b43278297f1d2ad773dcede4b6b472d9fd):

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[conan-center-bot]

Some configurations of 'gperf/cci.20201208' failed in build 3 (887dbe9c3f9b8a2569a0865e35d83e5885c671e6):

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• Linux x86_64, Release, gcc 4.9, libstdc++
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[conan-center-bot]

Some configurations of 'gperf/cci.20201208' failed in build 4 (11a81283408c0fef628dd4737a8a20c5544463a1):

• Linux x86_64, Release, gcc 4.9, libstdc++
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[conan-center-bot]

Some configurations of 'gperf/cci.20201208' failed in build 5 (e21e773d6dd79f7418665f4d7cffa699d91a421d):

• Macos x86_64, Release, apple-clang 9.1, libc++
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[prince-chrismc]

Blah