xbps-src: create XBPS_WRAPPERDIR via libexec/build.sh.

This way there's no stale files in other unrelated targets,
like `show-build-deps`.

common/xbps-src/libexec/build.sh

@@ -29,6 +29,8 @@ done
 setup_pkg "$PKGNAME" $XBPS_CROSS_BUILD
 readonly SOURCEPKG="$sourcepkg"
 
+mkdir -p $XBPS_WRAPPERDIR
+
 show_pkg_build_options
 check_pkg_arch $XBPS_CROSS_BUILD
 

common/xbps-src/shutils/common.sh

@@ -643,8 +643,6 @@ setup_pkg() {
     export XBPS_STATEDIR="${XBPS_BUILDDIR}/.xbps-${sourcepkg}"
     export XBPS_WRAPPERDIR="${XBPS_STATEDIR}/wrappers"
 
-    mkdir -p $XBPS_STATEDIR $XBPS_WRAPPERDIR
-
     source_file $XBPS_COMMONDIR/environment/build-style/${build_style}.sh
 
     # Source all build-helper files that are defined