devel/dmalloc: update to 5.6.4

Add LICENSE, regerate multiple patches, reorder variables, etc.

Accumulated ChangeLog:

Version 5.6.4 (12/24/2020):

• Fixed shared libary creation. Thanks to @ffontaine and Alex Suykov.
• Fixed one more pointer arithmetic issue. Thanks to aitap.
• Better configuring of the pointer arithmetic type.
• Fixed strndup macro detection... Again. Thanks to SkyOnce.

Version 5.6.3 (12/23/2020):

• Fixed missing dmallocc.o <- dmalloc.h dependency. Thanks to @ffontaine.
• Fixed more %p usage and issues around pointer arithmetic. Thanks to aitap.

Version 5.6.2 (12/17/2020):

• Fixed bug with loc_snprintf use of va_args. Thanks much to aitap.
• Handle strndup being a macro. Thanks much to aitap.
• Renmaed the ERROR_ and DEBUG_ defines to DMALLOC_* to reduce OS overlap.
• Fixed issues with cross-compiling and getpagesize. Thanks to aitap.
• Fixed problems with cross-compiling and printing of pointers. Thanks to aitap.

Version 5.6.1 (11/24/2020):

• Fixed the installdocs target. Thanks to matthewluckie.

Version 5.6.0 (11/22/2020):

• Implemented a snprintf to [hopefully] stop recursion. Thanks to drok.
• Added append_string and friends for better string output.
• Fixed strndup handling when it is a macro. Thanks to danielgora.
• Fixed strndup configuration and handling in general.
• Added better getenv handling.
• Fixed issues around page-size detection and heap extension.
• Added circleci to github.
• Improved the test program output.
• Added strnlen configuration and handling.
• Moved to git on April 9, 2018.

PR: 252124
Submitted by: mjl@luckie.org.nz (maintainer)