build_config/nofloat.rb: build configuration with `MRB_NO_FLOAT`; #5421

build_config/nofloat.rb

+MRuby::Build.new do |conf|
+  # load specific toolchain settings
+  toolchain :gcc
+
+  # include the GEM box
+  conf.gembox "stdlib"
+  conf.gembox "stdlib-ext"
+  conf.gembox "stdlib-io"
+  conf.gembox "metaprog"
+
+  conf.gem :core => 'mruby-bin-mruby'
+  conf.gem :core => 'mruby-bin-mirb'
+
+  conf.cc.defines << 'MRB_NO_FLOAT'
+
+  # Turn on `enable_debug` for better debugging
+  conf.enable_debug
+  conf.enable_test
+  conf.enable_bintest
+end