Arch Linux: fix build

For some reason, I started getting the following error when building our
Arch Linux package:

    CMake Error at cmake/QuickLintJSTarget.cmake:8 (add_executable):
      The install of the quick-lint-js target requires changing an RPATH from the
      build tree, but this is not supported with the Ninja generator unless on an
      ELF-based or XCOFF-based platform.  The CMAKE_BUILD_WITH_INSTALL_RPATH
      variable may be set to avoid this relinking step.
    Call Stack (most recent call first):
      src/CMakeLists.txt:22 (quick_lint_js_add_executable)

(Arch Linux is an ELF-based platform, so I don't know why we're getting
this error.)

Work around this error by applying the suggested fix.

Author: strager

dist/arch/PKGBUILD-dev

@@ -28,6 +28,7 @@ build() {
   cd quick-lint-js
   cmake -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_BUILD_WITH_INSTALL_RPATH=YES \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DQUICK_LINT_JS_INSTALL_LICENSES_DIR="share/licenses/${pkgname}" \
     -S . -B build

dist/arch/PKGBUILD-git

@@ -28,6 +28,7 @@ build() {
   cd quick-lint-js
   cmake -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_BUILD_WITH_INSTALL_RPATH=YES \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DQUICK_LINT_JS_INSTALL_LICENSES_DIR="share/licenses/${pkgname}" \
     -S . -B build

dist/arch/PKGBUILD-release

@@ -23,6 +23,7 @@ build() {
   cd "${pkgname}-${pkgver}"
   cmake -G Ninja \
     -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_BUILD_WITH_INSTALL_RPATH=YES \
     -DCMAKE_INSTALL_PREFIX=/usr \
     -DQUICK_LINT_JS_INSTALL_LICENSES_DIR="share/licenses/${pkgname}" \
     -S . -B build