add abseil recipe

recipes/abseil/all/abi_trick/conan_abi_test.cmake

@@ -0,0 +1,44 @@
+get_target_property(ABSL_INCLUDES absl::config INTERFACE_INCLUDE_DIRECTORIES)
+set(CMAKE_REQUIRED_INCLUDES ${ABSL_INCLUDES})
+
+check_cxx_source_compiles("
+#include \"absl/base/config.h\"
+#if defined(ABSL_HAVE_STD_STRING_VIEW) && ABSL_HAVE_STD_STRING_VIEW == 1
+int main() {}
+#else
+#error \"no std::string_view\"
+#endif
+"
+USE_STD_STRING_VIEW)
+
+check_cxx_source_compiles("
+#include \"absl/base/config.h\"
+#if defined(ABSL_HAVE_STD_ANY) && ABSL_HAVE_STD_ANY == 1
+int main() {}
+#else
+#error \"no std::any\"
+#endif
+"
+USE_STD_ANY)
+
+check_cxx_source_compiles("
+#include \"absl/base/config.h\"
+#if defined(ABSL_HAVE_STD_OPTIONAL) && ABSL_HAVE_STD_OPTIONAL == 1
+int main() {}
+#else
+#error \"no std::optional\"
+#endif
+"
+USE_STD_OPTIONAL)
+
+check_cxx_source_compiles("
+#include \"absl/base/config.h\"
+#if defined(ABSL_HAVE_STD_VARIANT) && ABSL_HAVE_STD_VARIANT == 1
+int main() {}
+#else
+#error \"no std::variant\"
+#endif
+"
+USE_STD_VARIANT)
+
+configure_file(${CMAKE_CURRENT_LIST_DIR}/abi.h.in ${PROJECT_BINARY_DIR}/abi.h)