Prevent stack overflow on very long command lists.
In "el-get-start-process-list", increase "max-specpdl-size" by 100 for each command in in the list. This allows "el-get-start-process-list" (but not other functions) to recurse indefinitely. This is needed for the emacs-goodies-el recipe, which generates many build commands and will overflow the default of max-specpdl-size during the build.
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