Re: rand48 replacement

> Attached v15 also does call srandom if it is there, and fixes yet another 
> remaining random call.

I think that I have now removed all references to "random" from pg source. 
However, the test still fails on windows, because the linker does not find 
a global variable when compiling extensions, but it seems to find the 
functions defined in the very same file...

Link:
  4130  C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\x86_amd64\link.exe /ERRORREPORT:QUEUE
/OUT:".\Release\tablefunc\tablefunc.dll"/INCREMENTAL:NO /NOLOGO Release/postgres/postgres.lib kernel32.lib user32.lib
gdi32.libwinspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib
/NODEFAULTLIB:libc/DEF:"./Release/tablefunc/tablefunc.def" /MANIFEST /MANIFESTUAC:"level='asInvoker' uiAccess='false'"
/manifest:embed/DEBUG /PDB:".\Release\tablefunc\tablefunc.pdb" /SUBSYSTEM:CONSOLE /STACK:"4194304" /TLBID:1
/DYNAMICBASE:NO/NXCOMPAT /IMPLIB:"Release/tablefunc/tablefunc.lib" /MACHINE:X64 /ignore:4197 /DLL
.\Release\tablefunc\win32ver.res
  4131  .\Release\tablefunc\tablefunc.obj
  4132     Creating library Release/tablefunc/tablefunc.lib and object Release/tablefunc/tablefunc.exp
  4133 tablefunc.obj : error LNK2001: unresolved external symbol pg_global_prng_state
[C:\projects\postgresql\tablefunc.vcxproj]
  4134 .\Release\tablefunc\tablefunc.dll : fatal error LNK1120: 1 unresolved externals
[C:\projects\postgresql\tablefunc.vcxproj]
  4135 Done Building Project "C:\projects\postgresql\tablefunc.vcxproj" (default targets) -- FAILED.

The missing symbol is really defined in common/pg_prng.c which AFAICT is 
linked with postgres.

If someone experienced with the windows compilation chain could give a 
hint of what is needed, I'd appreciate it!

-- 
Fabien.