Use build directory for builds

util/ci/build.sh

@@ -1,7 +1,7 @@
 #! /bin/bash -e
 
-mkdir cmakebuild
-cd cmakebuild
+mkdir build
+cd build
 cmake -DCMAKE_BUILD_TYPE=Debug \
 	-DRUN_IN_PLACE=TRUE -DENABLE_GETTEXT=TRUE \
 	-DBUILD_SERVER=TRUE ${CMAKE_FLAGS} ..

util/ci/clang-tidy.sh

@@ -1,7 +1,7 @@
 #! /bin/bash -eu
 
-mkdir -p cmakebuild
-cd cmakebuild
+mkdir -p build
+cd build
 cmake -DCMAKE_BUILD_TYPE=Debug \
 	-DCMAKE_EXPORT_COMPILE_COMMANDS=ON \
 	-DRUN_IN_PLACE=TRUE \
@@ -12,6 +12,6 @@ make GenerateVersion
 cd ..
 
 ./util/ci/run-clang-tidy.py \
-	-clang-tidy-binary=clang-tidy-9 -p cmakebuild \
+	-clang-tidy-binary=clang-tidy-9 -p build \
 	-quiet -config="$(cat .clang-tidy)" \
 	'src/.*'