build failure with parallel make

[Matthias Klose]

seen with -j32

/usr/bin/ld: cannot find -lgcj_bc
collect2: ld returned 1 exit status
make[7]: *** [ecjx] Error 1
make[7]: *** Waiting for unfinished jobs....
(cd .libs && rm -f libgcj_bc.so.1 && ln -s libgcj_bc.so.1.0.0
libgcj_bc.so.1)
(cd .libs && rm -f libgcj_bc.so && ln -s libgcj_bc.so.1.0.0
libgcj_bc.so)
creating libgcj_bc.la
(cd .libs && rm -f libgcj_bc.la && ln -s ../libgcj_bc.la libgcj_bc.la)


not sure what goes wrong, but 

if USE_LIBGCJ_BC
ecjx_DEPENDENCIES += libgcj_bc.la
endif

is already present.

  Matthias