[lazarus] double compiler commands problem found

[Peter Vreman]

The problem is the line "export FPCOPT" in lazarus/Makefile.fpc. FPCOPT is
a local variable that should not be exported, because all commandline
options are added to this variable and it is never reset. When you export
it you include the old commandline options also when another $(MAKE) call
is done from the Makefile, which is the case under win32, see the ide
target