This is a fork of rpmalloc, with the intent to be used in single threaded applications only, with old C99 compilers, and in old OS.

Summary of the changes:

• Works with single thread applications only
• Works with C99 compilers (C11 is not a required anymore)
• Remove thread safety
• Remove atomics usage
• Remove use of thread locals
• Remove statistics APIs
• Remove first class heaps APIs
• Remove APIs validations
• Remove huge page support
• Remove global cache support
• Remove malloc override support

By removing all this, it's much smaller, and works in old C compilers and Linux distributions, it was confirmed to work for example in Debian 4 with GCC 4.1, the original rpmalloc does not support many old Debian distributions due to use of C11 atomics.