Make Fortran $obj.provides.build targets not .PHONY

Commit 60cd72d0 (Cleaned up generation of symbolic rules, 2006-02-15)
incorrectly made these Makefile targets .PHONY even though the build
rule touches an actual file.  Correct it so that the copy_f90_mod and
touch steps do not happen on every "make".

Source/cmMakefileTargetGenerator.cxx

@@ -849,7 +849,7 @@ cmMakefileTargetGenerator
   p_depends.push_back(relativeObj);
   this->LocalGenerator->WriteMakeRule(*this->BuildFileStream, 0,
                                       temp.c_str(), p_depends, no_commands,
-                                      true);
+                                      false);
 }
 
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