Update dependency mini_portile2 to v2.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mini_portile2 (changelog)	2.8.4 -> 2.8.8

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Release Notes

flavorjones/mini_portile (mini_portile2)

v2.8.8

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Improved

• Raise an exception with a clear error message when xzcat is needed but is not installed. (#​152) @​flavorjones

v2.8.7

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Added

• When setting the C compiler through the MiniPortile constructor, the preferred keyword argument is now :cc_command. The original :gcc_command is still supported. (#​144 by @​flavorjones)
• Add support for extracting xz-compressed tarballs on OpenBSD. (#​141 by @​postmodern)
• Add OpenBSD support to the experimental method MakeMakefile#mkmf_config. (#​141 by @​flavorjones)

Changed

• MiniPortileCMake now detects the C and C++ compiler the same way MiniPortile does: by examining environment variables, then using kwargs, then looking in RbConfig (in that order). (#​144 by @​flavorjones)
• GPG file verification error messages are captured in the raised exception. Previously these errors went to stderr. (#​145 by @​flavorjones)

v2.8.6

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Added

• When using CMake on FreeBSD, default to clang's "cc" and "c++" compilers. (#​139 by @​mudge)

v2.8.5

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Added

• New methods #lib_path and #include_path which point at the installed directories under ports. (by @​flavorjones)
• Add config param for CMAKE_BUILD_TYPE, which now defaults to Release. (#​136 by @​Watson1978)

Experimental

Introduce experimental support for MiniPortile#mkmf_config which sets up MakeMakefile variables to properly link against the recipe. This should make it easier for C extensions to package third-party libraries. (by @​flavorjones)

• With no arguments, will set up just $INCFLAGS, $libs, and $LIBPATH.
• Optionally, if provided a pkg-config file, will use that config to more precisely set $INCFLAGS, $libs, $LIBPATH, and $CFLAGS/$CXXFLAGS.
• Optionally, if provided the name of a static archive, will rewrite linker flags to ensure correct linkage.

Note that the behavior may change slightly before official support is announced. Please comment on #​118 if you have feedback.

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