As GDCFLAGS is overriden by the top-level make file with '-O2 -g',
libphobos ends up always being built with all contracts, invariants, and
asserts compiled in. This adds a new configurable that defaults to omit
compiling any run-time checks into the library using '-frelease'.
Other choices either set the flags '-fno-release', enabling all run-time
checks, or '-fassert', which only compiles in asserts.
The omission of compiling in contracts results in a smaller library
size, with faster build times.
libphobos/ChangeLog:
PR d/94305
* Makefile.in: Regenerate.
* configure: Regenerate.
* configure.ac: Add --enable-libphobos-checking and substitute
CHECKING_DFLAGS. Remove -frelease from GDCFLAGS.
* libdruntime/Makefile.am: Add CHECKING_DFLAGS to AM_DFLAGS.
* libdruntime/Makefile.in: Regenerate.
* src/Makefile.am: Add CHECKING_DFLAGS to AM_DFLAGS.
* src/Makefile.in: Regenerate.
* testsuite/Makefile.in: Regenerate.
* testsuite/testsuite_flags.in: Add -fno-release -funittest to
--gdcflags.
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