Fix specs line endings

[rickertm]

On Windows with Git core.autocrlf enabled, the compilation fails with the following errors, as the files in the spec folder (enumglu.spec and glu.spec) have incorrect line endings (CR LF vs LF):

C:\superglu\libtess\tess.c(168): warning C4013: 'gluTessBeginPolygon' undefined; assuming extern returning int
C:\superglu\libtess\tess.c(172): warning C4013: 'gluTessBeginContour' undefined; assuming extern returning int
C:\superglu\libtess\tess.c(181): warning C4013: 'gluTessEndContour' undefined; assuming extern returning int
C:\superglu\libtess\tess.c(466): error C2371: 'gluTessBeginPolygon': redefinition; different basic types
C:\superglu\libtess\tess.c(480): error C2371: 'gluTessBeginContour': redefinition; different basic types
C:\superglu\libtess\tess.c(497): error C2371: 'gluTessEndContour': redefinition; different basic types