Build system: remove useless rules for preprocessed Fortran 2008 files

Automake actually provides such rules.

mex/build/matlab/mex.am

@@ -29,10 +29,6 @@ clean-local:
 		cd $(top_srcdir)/../../matlab && rm -f $(PROGRAMS); \
 	fi
 
-# Automake provides a default rule for .f08 files, but not .F08.
-%.o: %.F08
-	$(AM_V_FC)$(FCCOMPILE) $(DEFS) -c -o $@ $<
-
 # Rules for the Fortran 2008 interface to MEX and BLAS/LAPACK functions
 matlab_mat.mod: matlab_mex.o
 matlab_mex.mod: matlab_mex.o

mex/build/octave/mex.am

@@ -36,10 +36,6 @@ clean-local:
 		cd $(top_srcdir)/../../octave && rm -f $(PROGRAMS); \
 	fi
 
-# Automake provides a default rule for .f08 files, but not .F08
-%.o: %.F08
-	$(AM_V_FC)$(FCCOMPILE) $(DEFS) -c -o $@ $<
-
 # Rules for the Fortran 2008 interface to MEX and BLAS/LAPACK functions
 matlab_mat.mod: matlab_mex.o
 matlab_mex.mod: matlab_mex.o