Trac #18715: Move fixed part of build/Makefile to build/deps

The build rules (not the actual files) for the scripts and extcode
targets are "auto-generated" but they are really just one fixed block.
Move this to `build/deps` instead.

URL: http://trac.sagemath.org/18715
Reported by: jdemeyer
Ticket author(s): Jeroen Demeyer
Reviewer(s): Nathann Cohen

build/deps

@@ -126,3 +126,20 @@ $(INST)/sage: \
 		$(PIPE) 'time $(MAKE) sage 2>&1' 'tee -a $(SAGE_LOGS)/sage-$(SAGE_VERSION).log' && \
 		touch $@; \
 	fi
+
+
+###############################################################################
+# Building scripts and extcode
+###############################################################################
+
+# Don't just use "install" since we don't want to change permissions
+$(SAGE_LOCAL)/bin/%: $(SAGE_SRC)/bin/%
+	cp $< $@
+
+# Don't just use "install -D" since we don't want to change permissions.
+# cp won't correctly setup the SAGE_EXTCODE directory structure
+# (unlike install), so we need a mkdir here such that cp can copy into
+# an existing folder.
+$(SAGE_EXTCODE)/%: $(SAGE_SRC)/ext/%
+	@mkdir -p "$(@D)"
+	cp $< $@

build/install

@@ -411,19 +411,6 @@ for file in `find "$SAGE_SRC"/ext -type f`; do
 done
 echo >&5
 
-cat >&5 <<EOF
-# don't just use \`install\` since we don't want to change permissions
-\$(SAGE_LOCAL)/bin/%: \$(SAGE_SRC)/bin/%
-	cp \$< \$@
-
-# don't just use \`install -D\` since we don't want to change permissions
-# cp won't correctly setup the SAGE_EXTCODE directory structure (unlike install)
-# so we need a mkdir here to cp can copy into an existing folder
-\$(SAGE_EXTCODE)/%: \$(SAGE_SRC)/ext/%
-	@mkdir -p "\$(@D)"
-	cp \$< \$@
-EOF
-
 # Copy build/deps
 cat >&5 <<EOF