Some fixes regarding building make on Win32.

[Angel Tsankov]

I found the following changes useful when building make 3.80 on Win XP Pro 
SP1:

At build_32.bat:2 change +if to if

At README.W32:26 change namke to nmake

Insert the following lines at build_32.bat:60:
cl.exe /nologo /MT /W3 /GX /Zi /YX /Od /I . /I glob /I w32/include /D _DEBUG 
/D WINDOWS32 /D WIN32 /D _CONSOLE /D HAVE_CONFIG_H /FR.\WinDebug/ 
/Fp.\WinDebug/%make%.pch /Fo.\WinDebug/ /Fd.\WinDebug/%make%.pdb /c hash.c
echo WinDebug\hash.obj >>link.dbg

Insert the following lines at build_32.bat:125:
cl.exe /nologo /MT /W3 /GX /YX /O2 /I . /I glob /I w32/include /D NDEBUG /D 
WINDOWS32 /D WIN32 /D _CONSOLE /D HAVE_CONFIG_H /FR.\WinRel/ 
/Fp.\WinRel/%make%.pch /Fo.\WinRel/ /c hash.c
echo WinRel\hash.obj >>link.rel