fftw: fix yml format

[ericLemanissier]

Specify library name and version: fftw/*

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• I've read the contributing guidelines.
• I've used a recent Conan client version close to the currently deployed.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

Conan v1 pipeline ✔️

All green in build 2 (fde0b62b0b7cc9d354f57345766a1eafba9908aa):

• fftw/3.3.9@:
  All packages built successfully! (All logs)

• fftw/3.3.8@:
  All packages built successfully! (All logs)

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Conan v2 pipeline (informative, not required for merge) ❌

Note: Conan v2 builds are informative and they are not required for the PR to be merged.

The v2 pipeline failed. Please, review the errors and note this will be required for pull requests to be merged in the near future.

See details:

Failure in build 2 (fde0b62b0b7cc9d354f57345766a1eafba9908aa):

• fftw/3.3.9@:
  Error running command conan graph info --requires fftw/3.3.9@#54b76ddd6d90931bb59825bdf201e113 -f json -pr:h /home/conan/w/prod-v2_cci_PR-15653/2/19889965-b2d4-48f9-9338-b09572e4d1f5/profile_windows_192_release_dynamic_msvc_release_64.-shared-True.txt -pr:b /home/conan/w/prod-v2_cci_PR-15653/2/19889965-b2d4-48f9-9338-b09572e4d1f5/profile_windows_192_release_dynamic_msvc_release_64.-shared-True.txt:

  -------- Input profiles --------
  Profile host:
  [settings]
  arch=x86_64
  build_type=Release
  compiler=msvc
  compiler.runtime=dynamic
  compiler.runtime_type=Release
  compiler.version=192
  os=Windows
  [options]
  */*:shared=True
  
  Profile build:
  [settings]
  arch=x86_64
  build_type=Release
  compiler=msvc
  compiler.runtime=dynamic
  compiler.runtime_type=Release
  compiler.version=192
  os=Windows
  [options]
  */*:shared=True
  
  
  -------- Computing dependency graph --------
  ERROR: fftw/3.3.9: Error in configure() method, line 48
  	del self.options.fPIC
  	ConanException: option 'fPIC' doesn't exist
  Possible options are ['shared', 'precision', 'openmp', 'threads', 'combinedthreads', 'simd']
  

• fftw/3.3.8@:
  Error running command conan graph info --requires fftw/3.3.8@#3b4c116ffb76aefbe47003cc97cb54a9 -f json -pr:h /home/conan/w/prod-v2_cci_PR-15653/2/93b9f77b-9db2-44f7-a763-1660bdb1d7a9/profile_windows_192_release_dynamic_msvc_release_64.-shared-True.txt -pr:b /home/conan/w/prod-v2_cci_PR-15653/2/93b9f77b-9db2-44f7-a763-1660bdb1d7a9/profile_windows_192_release_dynamic_msvc_release_64.-shared-True.txt:

  -------- Input profiles --------
  Profile host:
  [settings]
  arch=x86_64
  build_type=Release
  compiler=msvc
  compiler.runtime=dynamic
  compiler.runtime_type=Release
  compiler.version=192
  os=Windows
  [options]
  */*:shared=True
  
  Profile build:
  [settings]
  arch=x86_64
  build_type=Release
  compiler=msvc
  compiler.runtime=dynamic
  compiler.runtime_type=Release
  compiler.version=192
  os=Windows
  [options]
  */*:shared=True
  
  
  -------- Computing dependency graph --------
  ERROR: fftw/3.3.8: Error in configure() method, line 48
  	del self.options.fPIC
  	ConanException: option 'fPIC' doesn't exist
  Possible options are ['shared', 'precision', 'openmp', 'threads', 'combinedthreads', 'simd']
  

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