[Bug 17463] New: Attempting to compile crosstest without mingw should issue error

http://bugs.winehq.org/show_bug.cgi?id=17463

Summary: Attempting to compile crosstest without mingw should
                    issue error
           Product: Wine
           Version: 1.1.15
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: download, source
          Severity: enhancement
          Priority: P2
         Component: build-env
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Not a big deal, just noticed that when I tried to compile the cross tests, it
failed. Forgetting I had recently reinstalled, I checked and I don't have
mingw.

make[1]: Entering directory `/home/austin/wine-git/dlls'
make[2]: Entering directory `/home/austin/wine-git/dlls/d3dx9_36'
false -k -l libd3dx9.a -d d3dx9_36.def
make[2]: *** [libd3dx9.a] Error 1
make[2]: Leaving directory `/home/austin/wine-git/dlls/d3dx9_36'
make[1]: *** [d3dx9_36/libd3dx9.a] Error 2
make[1]: Leaving directory `/home/austin/wine-git/dlls'
make: *** [dlls/__crosstest__] Error 2

The error message doesn't make it very obvious though...we should be able to
detect that pretty easily and print a better error message.