Miscellaneous patches from Ralf Corsepius <corsepiu@faw.uni-ulm.de>

that are part of the Makefile.am conversion effort but were missed
in the previous commits.

make/custom/gensh1.cfg

@@ -36,8 +36,6 @@ CFLAGS_DEBUG_V =
 # -O4 is ok for RTEMS
 CFLAGS_OPTIMIZE_V = -O4 
 
-CPPFLAGS+=$(BSP_CPPFLAGS)
-
 #  This section makes the target dependent options file.
 
 #  NDEBUG (C library)

make/custom/pc386.cfg

@@ -96,9 +96,10 @@ define make-exe
 	  $(START16FILE) $(START16ADDR) 0 $(basename $@).bin $(RELOCADDR) 0
 	$(NM) -g -n $(basename $@).obj > $(basename $@).num
 	$(SIZE) $(basename $@).obj
-        $(INSTALL_VARIANT) -m 555 $(basename $@).bt ${PROJECT_RELEASE}/BootImgs
+        @$(mkinstalldirs) ${PROJECT_RELEASE}/BootImgs
+        $(INSTALL_PROGRAM) $(basename $@).bt ${PROJECT_RELEASE}/BootImgs
 	$(CC) $(CPPFLAGS) $(CFLAGS) $(CFLAGS_LD) -Wl,-Ttext,$(RELOCADDR) \
-	    -o $(basename $@).coff $(LINK_OBJS) $(LINK_LIBS)
+	    -o $@ $(LINK_OBJS) $(LINK_LIBS)
 endef
 define make-cxx-exe
 	$(CXX) $(CPPFLAGS) $(CFLAGS) $(CFLAGS_LD) -Wl,-Ttext,$(RELOCADDR) \