Switch to pip for installing package

On macOS, the egg is generated for 10.9 and since the host machine is
probably 12.x, setuptools refuses to detect that as a valid egg and
proceeds to download and install.

xref: pypa/setuptools#3687

recipe/meta.yaml

@@ -21,8 +21,8 @@ build:
  number: 0
  # VS 2008 is not supported for libprotobuf
  skip: true # [win and py2k]
- script: python setup.py install --with-protobuf-include-dir=$PREFIX/include --with-protobuf-lib-dir=$PREFIX/lib --with-protoc=$BUILD_PREFIX/bin/protoc --with-mysql-capi=$PREFIX # [unix]
- script: python setup.py install --with-protobuf-include-dir=%LIBRARY_INC% --with-protobuf-lib-dir=%LIBRARY_LIB% --with-protoc=%LIBRARY_BIN%/protoc.exe --with-mysql-capi=%LIBRARY_PREFIX% --extra-compile-args=/DPROTOBUF_USE_DLLS # [win]
+ script: PROTOBUF_INCLUDE_DIR=$PREFIX/include PROTOBUF_LIB_DIR=$PREFIX/lib PROTOC=$BUILD_PREFIX/bin/protoc MYSQL_CAPI=$PREFIX pip install . --no-deps --verbose # [unix]
+ script: PROTOBUF_INCLUDE_DIR=%LIBRARY_INC% PROTOBUF_LIB_DIR=%LIBRARY_LIB% PROTOC=%LIBRARY_BIN%/protoc.exe MYSQL_CAPI=%LIBRARY_PREFIX% EXTRA_COMPILE_ARGS=/DPROTOBUF_USE_DLLS pip install . --no-deps --verbose # [win]
 
 
 requirements:
@@ -35,7 +35,7 @@ requirements:
 
  host:
  - python
- - setuptools
+ - pip
  - mysql-devel {{ version }}
  - libprotobuf
  - protobuf >=3.11.0,<=3.20.3