add stderr redirect for executing tests

add libdir detection for some special cases - partially resolves issue #440

revert last commit, because it reverted bug fix #570

fix usage of wrong debug/release varnames

revert previous "fix" regarding applying pre-defined flags to target flags (it was correct before)

fix missing spaces between build type flags and already set flags

fix predefined flags not taken into account for non-default targets

add support for wsize in C++ compiler detection

fix typo in compiler detection

more detailed output about build config

fix syntax error in check_cpp_compiler C++ test file

fixes wrong indentation

improve toolchain detection to also get the wordsize and stdc version, issue #439, issue #508

move debug/release flags from target to general flags, fixes #571

add configure command line to config.mk, fixes #563

(0) -100 -15 +15 tip

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