Stop generating include/*.h from configure

This was inconvenient when making changes to those central header files.
All `configure`-generated preprocessor symbols are now in `config.h`.

* configure.ac: Define various PROG_* symbols.  Remove AC_SUBST calls
for compressors and decompressors.
(AC_CONFIG_FILES): Remove include/comp_src.h and include/manconfig.h.
* m4/man-arg-override-dir.m4: Define OVERRIDE_DIR symbol.
* include/manconfig.h.in: Rename to ...
* include/manconfig.h: ... this.  Remove PROG_*, OVERRIDE_DIR, and
COMPRESS_EXT definitions.
* include/comp_src.h.in: Rename to ...
* include/comp_src.h: ... this.
* README.md: Update references to include/manconfig.h.
* .gitignore: Remove include/*.h.

1 files changed, 0 insertions, 1 deletions

diff --git a/.gitignore b/.gitignore
index b9c28a41..bd5b2d0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,7 +22,6 @@
 /libtool
 /stamp-h*
 docs/INSTALL.autoconf
-include/*.h
 init/systemd/man-db.conf
 init/systemd/man-db.service
 lib/.deps