Help autoconf find m4 on Xcode-only systems
Closes Homebrew/homebrew#24904.
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				@ -82,6 +82,7 @@ module Superenv
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    self['CMAKE_INCLUDE_PATH'] = determine_cmake_include_path
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					    self['CMAKE_INCLUDE_PATH'] = determine_cmake_include_path
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    self['CMAKE_LIBRARY_PATH'] = determine_cmake_library_path
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					    self['CMAKE_LIBRARY_PATH'] = determine_cmake_library_path
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    self['ACLOCAL_PATH'] = determine_aclocal_path
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					    self['ACLOCAL_PATH'] = determine_aclocal_path
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					    self['M4'] = MacOS.locate("m4") if deps.include? "autoconf"
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    # The HOMEBREW_CCCFG ENV variable is used by the ENV/cc tool to control
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					    # The HOMEBREW_CCCFG ENV variable is used by the ENV/cc tool to control
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    # compiler flag stripping. It consists of a string of characters which act
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					    # compiler flag stripping. It consists of a string of characters which act
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