xz: don't build docs on i686

mingw-w64-xz/PKGBUILD

@@ -5,7 +5,7 @@ _realname=xz
 pkgbase=mingw-w64-${_realname}
 pkgname="${MINGW_PACKAGE_PREFIX}-${_realname}"
 pkgver=5.6.3
-pkgrel=2
+pkgrel=3
 pkgdesc="Library and command line tools for XZ and LZMA compressed files (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32' 'clangarm64')
@@ -22,7 +22,7 @@ depends=("${MINGW_PACKAGE_PREFIX}-gettext-runtime")
 makedepends=("${MINGW_PACKAGE_PREFIX}-cc"
              "${MINGW_PACKAGE_PREFIX}-autotools"
              "${MINGW_PACKAGE_PREFIX}-gettext-tools"
-             "${MINGW_PACKAGE_PREFIX}-doxygen"
+             $([[ ${CARCH} == i686 ]] || echo "${MINGW_PACKAGE_PREFIX}-doxygen")
              "po4a")
 source=("https://github.com/tukaani-project/xz/releases/download/v${pkgver}/xz-${pkgver}.tar.xz"{,.sig})
 sha256sums=('db0590629b6f0fa36e74aea5f9731dc6f8df068ce7b7bafa45301832a5eebc3a'
@@ -39,11 +39,18 @@ prepare() {
 build() {
   mkdir -p "${srcdir}/build-${MSYSTEM}" && cd "${srcdir}/build-${MSYSTEM}"
 
+  declare -a _extra_config
+  if [[ ${CARCH} == i686 ]]; then
+    _extra_config+=("--disable-doxygen")
+  else
+    _extra_config+=("--enable-doxygen")
+  fi
+
   ../${_realname}-${pkgver}/configure \
     --prefix=${MINGW_PREFIX} \
     --disable-rpath \
     --disable-lzma-links \
-    --enable-doxygen
+    "${_extra_config}"
 
   make
 }
@@ -52,5 +59,6 @@ package() {
   cd "${srcdir}/build-${MSYSTEM}"
   make DESTDIR="${pkgdir}" install
 
-  install -Dm644 ${srcdir}/${_realname}-${pkgver}/COPYING* -t ${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}
+  install -Dm644 ${srcdir}/${_realname}-${pkgver}/COPYING* \
+    -t ${pkgdir}${MINGW_PREFIX}/share/licenses/${_realname}
 }