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Also remove linearization from qpdf-manual.pdf. It's a small file, and removing the dependency on the qpdf executable significantly shortens build times.
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External libraries for Windows are now built automatically in the qpdf/external-libs repository and include openssl in addition to zlib and jpeg. Use these, and update the Windows build to build with the openssl crypto provider by default. We leave the native crypto provider enabled in case there is a problem with openssl and also to continue to exercise that code.
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- Checks explicitly for versions >= 1.1.0 with pkg-config - Refactor the fallback checks. Previously they were copied from the gnutls logic, but could be slightly surprising (it's not obvious that they're for the case where pkg-config returns a false negative, and it's weird that the linker check overode the header check) - Fix the AC_SEARCH_LIBS check to try -lcrypto instead of -lopenssl (-lcrypto is the standard library OpenSSL ships the crypto symbols in). - Fix the AC_SEARCH_LIBS check to look for EVP_MD_CTX_new, which is not present in versions prior to 1.1.0. Fixes qpdf/qpdf#429 (although I haven't verified on cygwin)
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Use autoconf rather than ifdefs to determine what format string to use for long long.
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Fixes qpdf/qpdf#417
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For wildcard expansion to work properly with the msvc binary, it is necessary to link with setargv.obj or wsetargv.obj, depending on whether wmain is in use.
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Thanks to Zdenek Dohnal <zdohnal@redhat.com> for contributing the code used for the gnutls crypto provider.
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Includes updates to m4/ax_cxx_compile_stdcxx.m4 to make it work with msvc, which supports C++-11 with no flags but doesn't set __cplusplus to a recent value.