remove unsupported __builtin_setjmp - #2

(unknown):0: (unknown):0: (unknown):0: (unknown):0: (unknown):0: (unknown):0: (unknown):0: rake aborted!
Command failed with status (): ["C:/a/mruby/mruby/build/full-debug/mrbc/bi...]
C:/a/mruby/mruby/lib/mruby/build/command.rb:354:in 'MRuby::Command::Mrbc#run'
C:/a/mruby/mruby/lib/mruby/gem.rb:220:in 'block in MRuby::Gem::Specification#generate_gem_init'
C:/a/mruby/mruby/lib/mruby/gem.rb:215:in 'Kernel#open'
C:/a/mruby/mruby/lib/mruby/gem.rb:215:in 'MRuby::Gem::Specification#generate_gem_init'
C:/a/mruby/mruby/lib/mruby/gem.rb:209:in 'block in MRuby::Gem::Specification#define_gem_init_builder'
Tasks: TOP => test:run:serial => test:build => test:build:lib => all => gensym => C:/a/mruby/mruby/build/full-debug/presym => C:/a/mruby/mruby/build/full-debug/mrbgems/mruby-toplevel-ext/gem_init.pi => C:/a/mruby/mruby/build/full-debug/mrbgems/mruby-toplevel-ext/gem_init.c
(See full trace by running task with --trace)

(unknown):0: (unknown):0: (unknown):0: (unknown):0: (unknown):0: (unknown):0: rake aborted!
Command failed with status (): ["C:/a/mruby/mruby/build/full-debug/mrbc/bi...]
C:/a/mruby/mruby/lib/mruby/build/command.rb:354:in 'MRuby::Command::Mrbc#run'
C:/a/mruby/mruby/tasks/mrblib.rake:31:in 'block (3 levels) in <top (required)>'
C:/a/mruby/mruby/tasks/mrblib.rake:18:in 'IO.open'
C:/a/mruby/mruby/tasks/mrblib.rake:18:in 'block (2 levels) in <top (required)>'
Tasks: TOP => test:run:serial => test:build => test:build:lib => all => gensym => C:/a/mruby/mruby/build/full-debug/presym => C:/a/mruby/mruby/build/full-debug/mrblib/mrblib.pi => C:/a/mruby/mruby/build/full-debug/mrblib/mrblib.c
(See full trace by running task with --trace)