Fix FTBFS on F26 (and lower) due to debugedit failure

Remove the double slashes from #include lines in 2 files in WebRTC.

qt5-qtwebengine.spec

@@ -362,6 +362,10 @@ BuildArch: noarch
 # fix // in #include in content/renderer/gpu to avoid debugedit failure
 sed -i -e 's!gpu//!gpu/!g' \
   src/3rdparty/chromium/content/renderer/gpu/compositor_forwarding_message_filter.cc
+# and another one in 2 files in WebRTC
+sed -i -e 's!audio_processing//!audio_processing/!g' \
+  src/3rdparty/chromium/third_party/webrtc/modules/audio_processing/utility/ooura_fft.cc \
+  src/3rdparty/chromium/third_party/webrtc/modules/audio_processing/utility/ooura_fft_sse2.cc
 # remove ./ from #line commands in ANGLE to avoid debugedit failure (?)
 sed -i -e 's!\./!!g' \
   src/3rdparty/chromium/third_party/angle/src/compiler/preprocessor/Tokenizer.cpp \