first minor code improvements

add RegressionTest - fixes #264

fix missing initialization of CFLAGS and LDFLAGS when toolchain is unknown - fixes #288

add separating comment to config.mk

copy contents of toolchain.mk instead of including them - fixes #287

fix several unquoted variable uses

fixes several minor potential issues in configure script

dependency tests executed too late - fixes #282

fix mix of spaces and tabs

add check_lib() utility to toolchain.sh

don't use cflags/ldflags directly in the configure script - fixes #281

add XML schema - fixes #267

set minimum Java version to 17

fix missing chmod - close #278

(0) -14 +14 tip

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