Adding OpenBSD's sndio support.

Updating jackmsr's work, adding sndio cmake module.
Updating 64 bits OS arch detection (amd64).

cmake/modules/DetectMachine.cmake

@@ -3,7 +3,7 @@ IF(WIN32)
 ELSEIF(APPLE)
 	SET(LMMS_BUILD_APPLE 1)
 ELSEIF(${CMAKE_SYSTEM_NAME} MATCHES "OpenBSD")
-    SET(LMMS_BUILD_OPENBSD 1)
+	SET(LMMS_BUILD_OPENBSD 1)
 ELSEIF(HAIKU)
 	SET(LMMS_BUILD_HAIKU 1)
 ELSE()
@@ -27,7 +27,7 @@ ELSE(WIN32)
 	EXEC_PROGRAM( ${CMAKE_C_COMPILER} ARGS "-dumpmachine ${CMAKE_C_FLAGS}" OUTPUT_VARIABLE Machine )
 	MESSAGE("Machine: ${Machine}")
 	STRING(REGEX MATCH "i.86" IS_X86 "${Machine}")
-	STRING(REGEX MATCH "86_64" IS_X86_64 "${Machine}")
+	STRING(REGEX MATCH "86_64|amd64" IS_X86_64 "${Machine}")
 ENDIF(WIN32)
 
 IF(IS_X86)

cmake/modules/FindSndio.cmake

@@ -0,0 +1,32 @@
+# sndio check, based on FindAlsa.cmake
+#
+
+# Copyright (c) 2006, David Faure, <faure@kde.org>
+# Copyright (c) 2007, Matthias Kretz <kretz@kde.org>
+# Copyright (c) 2009, Jacob Meuser <jakemsr@sdf.lonestar.org>
+#
+# Redistribution and use is allowed according to the terms of the BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+
+include(CheckIncludeFiles)
+include(CheckIncludeFileCXX)
+include(CheckLibraryExists)
+
+# Already done by toplevel
+find_library(SNDIO_LIBRARY sndio)
+set(SNDIO_LIBRARY_DIR "")
+if(SNDIO_LIBRARY)
+   get_filename_component(SNDIO_LIBRARY_DIR ${SNDIO_LIBRARY} PATH)
+endif(SNDIO_LIBRARY)
+
+check_library_exists(sndio sio_open "${SNDIO_LIBRARY_DIR}" HAVE_SNDIO)
+if(HAVE_SNDIO)
+    message(STATUS "Found sndio: ${SNDIO_LIBRARY}")
+else(HAVE_SNDIO)
+    message(STATUS "sndio not found")
+endif(HAVE_SNDIO)
+set(SNDIO_FOUND ${HAVE_SNDIO})
+
+find_path(SNDIO_INCLUDES sndio.h)
+
+mark_as_advanced(SNDIO_INCLUDES SNDIO_LIBRARY)