pciutils: work around race condition in make install with high BR2_JLEVEL

Fixes http://autobuild.buildroot.net/results/908d7368c8dc8e320fd33f3193039f5925adc352



make install and install-lib can race against eachother causing 'install'
to fail. Work around it using MAKE1.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>