Conditionally include real_fourier_openmax.h.

The real_fourier_openmax.h header should only be included when
RTC_USE_OPENMAX_DL is defined.

Bug: None
Change-Id: I70a9c7745e2c24d15c7bb510d432638a2c70eef9
Reviewed-on: https://webrtc-review.googlesource.com/56841
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22167}
diff --git a/common_audio/real_fourier.cc b/common_audio/real_fourier.cc
index f759778..cb0a005 100644
--- a/common_audio/real_fourier.cc
+++ b/common_audio/real_fourier.cc
@@ -11,10 +11,13 @@
 #include "common_audio/real_fourier.h"
 
 #include "common_audio/real_fourier_ooura.h"
-#include "common_audio/real_fourier_openmax.h"
 #include "common_audio/signal_processing/include/signal_processing_library.h"
 #include "rtc_base/checks.h"
 
+#ifdef RTC_USE_OPENMAX_DL
+#include "common_audio/real_fourier_openmax.h"
+#endif
+
 namespace webrtc {
 
 using std::complex;
@@ -54,4 +57,3 @@
 }
 
 }  // namespace webrtc
-
diff --git a/common_audio/real_fourier_openmax.h b/common_audio/real_fourier_openmax.h
index 7b4299a..af91dde 100644
--- a/common_audio/real_fourier_openmax.h
+++ b/common_audio/real_fourier_openmax.h
@@ -11,6 +11,10 @@
 #ifndef COMMON_AUDIO_REAL_FOURIER_OPENMAX_H_
 #define COMMON_AUDIO_REAL_FOURIER_OPENMAX_H_
 
+#ifndef RTC_USE_OPENMAX_DL
+#error "Only include this header if RTC_USE_OPENMAX_DL is defined."
+#endif
+
 #include <complex>
 
 #include "common_audio/real_fourier.h"
@@ -41,4 +45,3 @@
 }  // namespace webrtc
 
 #endif  // COMMON_AUDIO_REAL_FOURIER_OPENMAX_H_
-
diff --git a/common_audio/real_fourier_unittest.cc b/common_audio/real_fourier_unittest.cc
index 97849b9..5ac39b2 100644
--- a/common_audio/real_fourier_unittest.cc
+++ b/common_audio/real_fourier_unittest.cc
@@ -13,9 +13,12 @@
 #include <stdlib.h>
 
 #include "common_audio/real_fourier_ooura.h"
-#include "common_audio/real_fourier_openmax.h"
 #include "test/gtest.h"
 
+#ifdef RTC_USE_OPENMAX_DL
+#include "common_audio/real_fourier_openmax.h"
+#endif
+
 namespace webrtc {
 
 using std::complex;
@@ -106,4 +109,3 @@
 }
 
 }  // namespace webrtc
-