Initial commit

added libraries:
opus
flac
libsndfile

updated:
libvorbis
libogg
openal

- Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.

Engine/lib/libsndfile/cmake/sqlite/FindSQLite3.cmake

@@ -0,0 +1,56 @@
+# - Find SQLite3
+# Find the native SQLite3 includes and libraries
+#
+#  SQLite3_INCLUDE_DIRS - where to find sqlite3.h, etc.
+#  SQLite3_LIBRARIES    - List of libraries when using SQLite3.
+#  SQLite3_FOUND        - True if SQLite3 found.
+
+if (SQLite3_INCLUDE_DIR)
+	# Already in cache, be silent
+	set (SQLite3_FIND_QUIETLY TRUE)
+endif ()
+
+find_package (PkgConfig QUIET)
+pkg_check_modules (PC_SQLite3 QUIET sqlite3)
+
+set (SQLite3_VERSION ${PC_SQLite3_VERSION})
+
+find_path (SQLite3_INCLUDE_DIR sqlite3.h
+	HINTS
+		${PC_SQLite3_INCLUDEDIR}
+		${PC_SQLite3_INCLUDE_DIRS}
+		${SQLite3_ROOT}
+	)
+
+find_library (SQLite3_LIBRARY
+	NAMES
+		sqlite3
+	HINTS
+		${PC_SQLite3_LIBDIR}
+		${PC_SQLite3_LIBRARY_DIRS}
+		${SQLite3_ROOT}
+	)
+
+include (FindPackageHandleStandardArgs)
+
+find_package_handle_standard_args (SQLite3
+	REQUIRED_VARS
+		SQLite3_LIBRARY
+		SQLite3_INCLUDE_DIR
+	VERSION_VAR
+		SQLite3_VERSION
+	)
+
+if (SQLite3_FOUND)
+	set (SQLite3_INCLUDE_DIRS ${SQLite3_INCLUDE_DIR})
+	set (SQLite3_LIBRARIES ${SQLite3_LIBRARY})
+	if (NOT TARGET SQLite::SQLite3)
+		add_library (SQLite::SQLite3 UNKNOWN IMPORTED)
+		set_target_properties (SQLite::SQLite3 PROPERTIES
+			INTERFACE_INCLUDE_DIRECTORIES "${SQLite3_INCLUDE_DIRS}"
+			IMPORTED_LOCATION "${SQLite3_LIBRARIES}"
+		)
+	endif ()
+endif ()
+
+mark_as_advanced (SQLite3_INCLUDE_DIR SQLite3_LIBRARY)