This helps https://bugs.gnu.org/67539.
* bin/automake.in <register_language>: pass libtool_flag
of OBJC and OBJCXX for the respective languages.
'compiler' => 'OBJCCOMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_flag' => 'OBJC',
'lder' => 'OBJCLD',
'ld' => '$(OBJC)',
'pure' => 1,
'compiler' => 'OBJCXXCOMPILE',
'compile_flag' => '-c',
'output_flag' => '-o',
+ 'libtool_flag' => 'OBJCXX',
'lder' => 'OBJCXXLD',
'ld' => '$(OBJCXX)',
'pure' => 1,