deps/openssl: bump version from 1.1.0f to 1.1.1c. (#601)

* deps/openssl: bump version from 1.1.0f to 1.1.1c.

This should fix some (not all) macOS compilation issues from #439.

* deps/openssl: add Threads to openssl-crypto's target_link_libraries().

deps/openssl/CMakeLists.txt

@@ -10,6 +10,7 @@ endif()
 message(STATUS "  --> OpenSSL will be built as an external project")
 
 find_package(Perl REQUIRED)
+find_package(Threads REQUIRED)
 
 include(ExternalProject)
 include(ProcessorCount)
@@ -124,9 +125,9 @@ endif()
 set(OPENSSL_PREFIX         "${CMAKE_CURRENT_BINARY_DIR}/openssl")
 set(OPENSSL_SRC_DIR        "${OPENSSL_PREFIX}/src/openssl")
 set(OPENSSL_INSTALL_DIR    "${OPENSSL_PREFIX}/src/openssl-install")
-set(OPENSSL_VERSION        "1.1.0f")
+set(OPENSSL_VERSION        "1.1.1c")
 set(OPENSSL_URL            "https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz")
-set(OPENSSL_ARCHIVE_SHA256 "12f746f3f2493b2f39da7ecf63d7ee19c6ac9ec6a4fcd8c229da8a522cb12765")
+set(OPENSSL_ARCHIVE_SHA256 "f6fb3079ad15076154eda9413fed42877d668e7069d9b87396d0804fdb3f4c90")
 set(OPENSSL_DOWNLOAD_NAME  "openssl.tar.gz")
 
 set(OPENSSL_CONFIGURE_OPTIONS
@@ -173,6 +174,7 @@ set(OPENSSL_LIBRARIES
 add_library(openssl-crypto INTERFACE)
 target_include_directories(openssl-crypto SYSTEM INTERFACE "${OPENSSL_INSTALL_DIR}/include")
 target_link_libraries(openssl-crypto INTERFACE "${OPENSSL_INSTALL_DIR}/lib/libcrypto${CMAKE_STATIC_LIBRARY_SUFFIX}")
+target_link_libraries(openssl-crypto INTERFACE Threads::Threads)
 if(MSVC)
 	target_link_libraries(openssl-crypto INTERFACE ws2_32 gdi32 advapi32 crypt32 user32)
 endif()