made the stl reader check for ascii file keyword instead of computing binary size

8 jobs for stlTypeCheck in 53 minutes and 32 seconds
Name Stage Failure
failed
gcc-c++11 Test There is an unknown failure, please try again
make[2]: *** Waiting for unfinished jobs....
CMakeFiles/Makefile2:119: recipe for target 'src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/all' failed
make[1]: *** [src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
CMakeFiles/Makefile2:156: recipe for target 'src/OpenMesh/Core/CMakeFiles/OpenMeshCoreStatic.dir/all' failed
make[1]: *** [src/OpenMesh/Core/CMakeFiles/OpenMeshCoreStatic.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
ERROR: Build failed: exit status 1
failed
clang-c++11 Test There is an unknown failure, please try again
                                       ^
2 errors generated.
src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/build.make:134: recipe for target 'src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/IO/reader/STLReader.cc.o' failed
make[2]: *** [src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/IO/reader/STLReader.cc.o] Error 1
CMakeFiles/Makefile2:119: recipe for target 'src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/all' failed
make[1]: *** [src/OpenMesh/Core/CMakeFiles/OpenMeshCore.dir/all] Error 2
Makefile:149: recipe for target 'all' failed
make: *** [all] Error 2
ERROR: Build failed: exit status 1