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, 3 insertions, 3 deletions

diff --git a/README.md b/README.md
index fb4d095e..77072d23 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ As of May 13th, 2001, the last public release of the Filesystem Hierarchy
 Standard proposed the root of the manual page hierarchy as `/usr/share` and
 the root of the writable cat hierarchy as `/var/cache/man` for the purposes
 of man-to-cat filename translation.  As such, the following are defined in
-`./include/manconfig.h.in`:
+`./include/manconfig.h`:
 
 ```c
 #define FHS_CAT_ROOT    "/var/cache/man"        /* required by fsstnd() */
@@ -172,8 +172,8 @@ Configure man-db:
 **Browse** or **edit** the following files that were created by the
 configuration process:
 
-* `include/manconfig.h` regarding paths to support programs,
-  the default section list and other specific definitions.
+* `include/manconfig.h` regarding the default section list and other
+  specific definitions.
 
 * `include/comp_src.h` if the default compressor support is
   inadequate for your requirements.  (Usually `.Z` [compress],