The commit efbf14e6 caused cross-compilation errors when building from Windows to Linux.

@FPK2 @lazidealist The commit efbf14e6 caused cross-compilation error Internal error 200412152 when building from Windows to Linux.

# lazarus\lazbuild -B --os=linux --cpu=x86_64 --pcp="%cd%\config_lazarus" --lazarusdir="%cd%\lazarus" --language=en D:\Borland\mORMot2\packages\lazarus\mormot2.lpk
......
(3104) Compiling D:\Borland\mORMot2\src\net\mormot.net.sock.pas
D:\Borland\mORMot2\src\net\mormot.net.sock.pas(3429,1) Fatal: Internal error 200412152
Fatal: (1018) Compilation aborted
Error: C:\fpcbuild\fpc\bin\i386-win32\ppcrossx64.exe returned an error exitcode
Error: (lazarus) Compile package mormot2 2.4: stopped with exit code 1
Error: (lazbuild) "mormot2 2.4": compilation failed