meson: remove config.h.in

meson.build

@@ -18,6 +18,6 @@ int main() {
 result = compiler.run(exim4_code)
 local_scan_version = result.stdout().strip().to_int()
 
-conf_data.set('local_scan_version', local_scan_version)
+conf_data.set('LOCAL_SCAN_VERSION', local_scan_version)
 
 subdir('src')

src/config.h.in

@@ -1,4 +0,0 @@
-#pragma once
-
-#define LOCAL_SCAN_VERSION @local_scan_version@
-

src/meson.build

@@ -1,4 +1,4 @@
-configure_file(input: 'config.h.in',
+configure_file(
 		      output: 'config.h',
 		      configuration: conf_data)