fix(docs): Add brew prefix to macOS build instructions

Update brew's qt5 to qt@5, following brew naming deprecation.

.ci-scripts/build-osx.sh

@@ -25,7 +25,7 @@ build_qtox() {
         -DSPELL_CHECK=OFF \
         -DSTRICT_OPTIONS=ON \
         -DCMAKE_BUILD_TYPE=Release \
-        -DCMAKE_PREFIX_PATH="$(brew --prefix qt5)" .
+        -DCMAKE_PREFIX_PATH="$(brew --prefix qt@5)" .
     make -j$(sysctl -n hw.ncpu)
     export CTEST_OUTPUT_ON_FAILURE=1
     ctest -j$(sysctl -n hw.ncpu)

CMakeLists.txt

@@ -62,7 +62,7 @@ if(APPLE)
 endif()
 
 execute_process(
-  COMMAND brew --prefix qt5
+  COMMAND brew --prefix qt@5
   OUTPUT_VARIABLE QT_PREFIX_PATH
   OUTPUT_STRIP_TRAILING_WHITESPACE)
 

INSTALL.md

@@ -446,7 +446,7 @@ Finally, build qTox.
 ```bash
 mkdir -p _build
 cd _build
-cmake ..
+cmake .. -DCMAKE_PREFIX_PATH=$(brew --prefix qt@5)
 make -j$(sysctl -n hw.ncpu)
 make install
 ```

osx/Brewfile

@@ -11,7 +11,7 @@ brew "cmake"
 brew "ffmpeg"
 brew "libexif"
 brew "qrencode"
-brew "qt5"
+brew "qt@5"
 brew "sqlcipher"
 brew "openal-soft"
 brew "msgpack"