config: Change the generated settings-history-core from .h to .c

This changes the output file to a header file instead of a C file, this helps meson deal
better with dependencies on custom_targets.

It is technically an #included header file so it makes sense.

The ideal solution would be to keep it as a C file, and add forward declarations of the
arrays defined in it instead of verbatim #include'ing it. However, array forward decls are
not possible without a specified size which cannot be provided in advance and declaring
them as pointers is perhaps not the best idea.

Author: fredmorcos

.gitignore

@@ -78,7 +78,7 @@ doc/wiki/*.txt
 doc/wiki/Makefile.am
 src/anvil/anvil
 src/auth/auth
-src/lib-settings/settings-history-core.c
+src/lib-settings/settings-history-core.h
 src/config/all-settings.c
 src/config/config
 src/config/doveconf

src/lib-settings/Makefile.am

@@ -19,11 +19,11 @@ headers = \
 pkginc_libdir=$(pkgincludedir)
 pkginc_lib_HEADERS = $(headers)
 
-BUILT_SOURCES = settings-history-core.c
+BUILT_SOURCES = settings-history-core.h
 
-settings-history.c: settings-history-core.c
+settings-history.c: settings-history-core.h
 
-settings-history-core.c: $(srcdir)/settings-history-core.txt $(srcdir)/settings-history.py
+settings-history-core.h: $(srcdir)/settings-history-core.txt $(srcdir)/settings-history.py
 	$(AM_V_GEN)$(srcdir)/settings-history.py --pro $(DOVECOT_PRO_BUILD) $< $@
 
 EXTRA_DIST = \

src/lib-settings/settings-history.c

@@ -4,7 +4,7 @@
 #include "array.h"
 #include "settings-history.h"
 
-#include "settings-history-core.c"
+#include "settings-history-core.h"
 
 static struct settings_history history;