[lazarus] mwedit compilation on windows

[Viincent Snijders]

I have tried to compile the mwedit files.
Since I work on a windows machine I get different errors.

I made the following change in the makefile:
# Default place of the makefile.fpc
# works on Linux but not on windows DEFAULTFPCDIR=/opt/fpc
DEFAULTFPCDIR=$(FPCDIR)

I added the following line in rtl/win32/wininc/base.inc :
     PInteger = ^Integer;
In Delphi it is declared in de windows.pas, but is declared not yet in de
windows unit.
Same goes for : PSmallint.
PLongint and PDouble are also in the Delphi windows.pas and not in base.inc,
but they are declared elsewhere also, so I don't know if they are needed in
base.inc too.