prepare for "--with-gcc=" to be removed from configure: instead invocing "native" (i.e., non-gcc) compilation via "configure --with-gcc=no", we now use "configure CC=<C-compiler> CXX=<C++-compiler>"
prepare for "--with-gcc=" to be removed from configure:
instead invocing "native" (i.e., non-gcc) compilation via
"configure --with-gcc=no", we now use
"configure CC=<C-compiler> CXX=<C++-compiler>"

(except for the buildtools, which are not ready for native compilation;
 hence, CXX=<C++-compiler> is actually not required, as we (currently)
 do not have any C++ code other than MEL ...)

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb