r.mapcalc: Add explicit dependency on mapcalc.tab.h (OSGeo#3415)

Add explicit dependency on mapcalc.tab.c to tell make that both .c and .h are needed
This allows for reproducible builds.

Without this change, r.mapcalc and r3.mapcalc
would be rebuilt a 2nd time in a make -j1 run
with slightly varied order of mapcalc.yy.o and mapcalc.tab.o

This might help improve OSGeo#3406

This patch was done while working on reproducible builds for openSUSE.

raster/r.mapcalc/Makefile

@@ -20,7 +20,9 @@ default: multi
 $(BIN)/$(PGM2)$(EXE): LIBES = $(LIBES2)
 $(BIN)/$(PGM3)$(EXE): LIBES = $(LIBES3)
 
-$(OBJDIR)/mapcalc.yy.o: mapcalc.tab.h
+$(OBJDIR)/*.o: mapcalc.tab.h mapcalc.tab.c
+$(OBJDIR)/mapcalc.yy.o: mapcalc.tab.h mapcalc.tab.c
+
 
 .SECONDARY: mapcalc.tab.c mapcalc.tab.h mapcalc.output