Add proof-of-concept screen sharing on macOS.

docs/building-msvc-x64.md

@@ -145,8 +145,18 @@ Open **x64 Native Tools Command Prompt for VS 2019.bat**, go to ***BuildPath***
     cd win32\VS2015
     msbuild opus.sln /property:Configuration=Debug /property:Platform="x64"
     msbuild opus.sln /property:Configuration=Release /property:Platform="x64"
+    cd ..\..\..
 
-    cd ..\..\..\..\..
+    git clone https://github.com/desktop-app/rnnoise.git
+    cd rnnoise
+    mkdir out
+    cd out
+    cmake -A x64 ..
+    cmake --build . --config Debug
+    cmake --build . --config Release
+    cd ..\..
+
+    cd ..\..
     SET PATH_BACKUP_=%PATH%
     SET PATH=%cd%\ThirdParty\msys64\usr\bin;%PATH%
     cd Libraries\win64

docs/building-msvc.md

@@ -145,18 +145,18 @@ Open **x86 Native Tools Command Prompt for VS 2019.bat**, go to ***BuildPath***
     cd win32\VS2015
     msbuild opus.sln /property:Configuration=Debug /property:Platform="Win32"
     msbuild opus.sln /property:Configuration=Release /property:Platform="Win32"
+    cd ..\..\..
 
     git clone https://github.com/desktop-app/rnnoise.git
     cd rnnoise
-    git checkout tdesktop
     mkdir out
     cd out
     cmake -A Win32 ..
     cmake --build . --config Debug
     cmake --build . --config Release
-    cd ..
+    cd ..\..
 
-    cd ..\..\..\..
+    cd ..
     SET PATH_BACKUP_=%PATH%
     SET PATH=%cd%\ThirdParty\msys64\usr\bin;%PATH%
     cd Libraries

docs/building-xcode.md

@@ -97,7 +97,7 @@ Go to ***BuildPath*** and run
     make build_libs $MAKE_THREADS_CNT
     cd ..
 
-    git clone https://github.com/xiph/opus
+    git clone https://github.com/xiph/opus.git
     cd opus
     git checkout v1.3
     ./autogen.sh
@@ -106,6 +106,21 @@ Go to ***BuildPath*** and run
     sudo make install
     cd ..
 
+    git clone https://github.com/desktop-app/rnnoise.git
+    cd rnnoise
+    mkdir out
+    cd out
+    mkdir Debug
+    cd Debug
+    cmake -G Ninja  -DCMAKE_BUILD_TYPE=Debug ../..
+    ninja
+    cd ..
+    mkdir Release
+    cd Release
+    cmake -G Ninja  -DCMAKE_BUILD_TYPE=Release ../..
+    ninja
+    cd ../../..
+
     libiconv_ver=1.16
     wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-$libiconv_ver.tar.gz
     tar -xvzf libiconv-$libiconv_ver.tar.gz