Fwd: AC_FC_LIBRARY_LDFLAGS

[Christopher Hulbert]

I couldn't find any other solution to this, but when getting the
library flags of pgf90 with -Mconcur or -Mipa (Runs pgipa) there is an
empty -l in an ignore string pasted below.  This messes up the FCLIBS
later and makes the compiler complain because it lumps the next
argument as the library name.

 /usr/local/pgi/linux86-64/6.0/bin/pgipa -v -finalo conftest -ignore
'-Mextract -L -I -Mkeepasm -Mpreprocess -l -Minline' -nop   .....

 I was able to solve this by adding
 -l)
     ;;

 to configure and more permanently the _AC_FC_LIBRARY_LDFLAGS function
in fortran.m4