Remove (redefined) macro PG_VERSION and replace with PACKAGE_VERSION

The previous macro collided with one already defined by PostgreSQL
and on some platforms it is not always in the same form causing
lots of build warnings.

src/config.h.in

@@ -9,7 +9,6 @@
 #define TIMESCALEDB_MOD_VERSION "@VERSION_MOD@"
 #define BUILD_OS_NAME "@CMAKE_SYSTEM_NAME@"
 #define BUILD_OS_VERSION "@CMAKE_SYSTEM_VERSION@"
-#define PG_VERSION "@PG_VERSION@"
 /*
  * Value should be set in package release scripts. Otherwise
  * defaults to "source"

src/telemetry/telemetry.c

@@ -198,7 +198,11 @@ build_version_body(void)
 	else
 		jsonb_add_pair(parseState, REQ_OS, "Unknown");
 
-	jsonb_add_pair(parseState, REQ_PS_VERSION, PG_VERSION);
+	/*
+	 * PACKAGE_VERSION does not include extra details that some systems (e.g.,
+	 * Ubuntu) sometimes include in PG_VERSION
+	 */
+	jsonb_add_pair(parseState, REQ_PS_VERSION, PACKAGE_VERSION);
 	jsonb_add_pair(parseState, REQ_TS_VERSION, TIMESCALEDB_VERSION_MOD);
 	jsonb_add_pair(parseState, REQ_BUILD_OS, BUILD_OS_NAME);
 	jsonb_add_pair(parseState, REQ_BUILD_OS_VERSION, BUILD_OS_VERSION);