Provides the CFLAGS to pass to the compiler so that it finds OpenSSL header files etc.
Default is to query pkg-config,
or failing that,
to use no particular CFLAGS.
Provides the LDFLAGS to pass to the linker so that it finds OpenSSL libraries etc.
Default is to query pkg-config,
or failing that,
to use only -lcrypto -lssl.
Enables "full_debugging" in Crypt::OpenSSL::CA::Inline::C while running ./Build test.
Setting the FULL_DEBUGGING environment variable to 1 has the same effect,
however the latter is not possible eg from the Perl debugger.
Implies use_blib=0 (see My::Module::Build).
Overloaded so as to set a flag indicating that we are running from ./Build and not Build.PL,
for the benefit of "fail_because_of_openssl_libs" which can thereafter act coy on CPAN::Reporter.
Overloaded so as to also call "ACTION_buildXS".
Builds the XS modules for distribution into "arch" in blib. Calls "check_openssl_version_number".
