Make Linux build scripts directory agnostic

Using the script location as an anchor, the scripts can now be called
from anywhere and work.

build_scripts/linux/build_linux.sh

@@ -1,18 +1,20 @@
 #!/usr/bin/env bash
 set -e
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
-. $DIR/configure.sh
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+PROJECT_DIR=$SCRIPT_DIR/../../
+BUILD_DIR=$PROJECT_DIR/build/
+. $SCRIPT_DIR/configure.sh
 
 echo $MAKE_COMMAND
-mkdir -p build
-cd build
+mkdir -p $BUILD_DIR
+cd $BUILD_DIR
 qmake --version
-qmake -spec $QMAKE_SPEC ..
+qmake -spec $QMAKE_SPEC $PROJECT_DIR
 $MAKE_COMMAND
 $CLANG_TIDY
-cp -r ../src/res ./bin/linux/AdvancedSettings/
-cp ../src/package_files/action_manifest.json ./bin/linux/AdvancedSettings/
-cp ../src/package_files/manifest.vrmanifest ./bin/linux/AdvancedSettings/
-cp -r ../src/package_files/default_action_manifests ./bin/linux/AdvancedSettings/
-cp ../third-party/openvr/lib/linux64/libopenvr_api.so ./bin/linux/AdvancedSettings/
-cp ../build_scripts/linux/run-with-library.sh ./bin/linux/AdvancedSettings/
+cp -r $PROJECT_DIR/src/res $BUILD_DIR/bin/linux/AdvancedSettings/
+cp $PROJECT_DIR/src/package_files/action_manifest.json $BUILD_DIR/bin/linux/AdvancedSettings/
+cp $PROJECT_DIR/src/package_files/manifest.vrmanifest $BUILD_DIR/bin/linux/AdvancedSettings/
+cp -r $PROJECT_DIR/src/package_files/default_action_manifests $BUILD_DIR/bin/linux/AdvancedSettings/
+cp $PROJECT_DIR/third-party/openvr/lib/linux64/libopenvr_api.so $BUILD_DIR/bin/linux/AdvancedSettings/
+cp $PROJECT_DIR/build_scripts/linux/run-with-library.sh $BUILD_DIR/bin/linux/AdvancedSettings/

build_scripts/linux/configure.sh

@@ -14,6 +14,6 @@ else
     # Clean up the artifacts and run everything together in that case.
     MAKE_COMMAND='bear make --jobs'
     QMAKE_SPEC='linux-clang'
-    CLANG_TIDY='../build_scripts/linux/run-clang-tidy.sh'
+    CLANG_TIDY='$SCRIPT_DIR/run-clang-tidy.sh'
 fi