DIFMAP v2.5q Rev 5

Fixing the recent issues identified for v2.5q formula.

• Providing an ad-hoc fix for the recent homebrew behavior (version? or macOS/xcode ver?) which no longer ignore an issue related to incompatible-pointer-types in libtecr_src/getline.c (Issue #3)
• Fixing a bug in the installation of help files (Issue #4)
• Updating the patche file for configure to completely override the initial values of HELP_DIR and PGPLOT_LIB in configure.

Full Changelog: 2.5q...2.5q_rev5