First part of minor dropbear package cleanup - this part lets the
package build as a normal user

+ don't refer to MAKEFLAGS outside of pkgsrc/mk
+ add comments to patch files
+ use BSD_INSTALL_* definitions in the build Makefile
+ re-order some parts of the pkgsrc Makefile
+ use pkgsrc definitions for CFLAGS.${OPSYS} rather than conditionals

XXX - TO DO - fix the xauth issue here

(agc)