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cmake - add include guards to cmake files

Signed-off-by: Mark Harris <mark.hsj@gmail.com>

--- a/cmake/OpusBuildtype.cmake

+++ b/cmake/OpusBuildtype.cmake

@@ -1,4 +1,8 @@

 # Set a default build type if none was specified

+if(__opus_buildtype)

+  return()

+endif()

+set(__opus_buildtype INCLUDED)

 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)

   if(CMAKE_C_FLAGS)

--- a/cmake/OpusConfig.cmake

+++ b/cmake/OpusConfig.cmake

@@ -1,3 +1,8 @@

+if(__opus_config)

+  return()

+endif()

+set(__opus_config INCLUDED)

+

 include(OpusFunctions)

 configure_file(${CMAKE_SOURCE_DIR}/cmake/config.h.cmake.in config.h @ONLY)

--- a/cmake/OpusFunctions.cmake

+++ b/cmake/OpusFunctions.cmake

@@ -1,8 +1,7 @@

-#[[Cmake helper function to parse source files from make files

-this is to avoid breaking existing make and auto make support

-but still have the option to use CMake with only lists at one place]]

-

-cmake_minimum_required(VERSION 3.1)

+if(__opus_functions)

+  return()

+endif()

+set(__opus_functions INCLUDED)

 function(get_library_version OPUS_LIBRARY_VERSION OPUS_LIBRARY_VERSION_MAJOR)

   file(STRINGS configure.ac opus_lt_current_string

--- a/cmake/OpusSources.cmake

+++ b/cmake/OpusSources.cmake

@@ -1,3 +1,8 @@

+if(__opus_sources)

+  return()

+endif()

+set(__opus_sources INCLUDED)

+

 include(OpusFunctions)

 get_opus_sources(SILK_HEAD silk_headers.mk silk_headers)