don't redefine _(s) since we don't include libpq-int.h anymore

Author: funny-falcon

src/pg_probackup.h

@@ -47,12 +47,6 @@
 #error Windows port requires compilation in MinGW64 UCRT environment
 #endif
 
-#if PG_VERSION_NUM >= 150000
-// _() is explicitly undefined in libpq-int.h
-// https://github.com/postgres/postgres/commit/28ec316787674dd74d00b296724a009b6edc2fb0
-#define _(s) gettext(s)
-#endif
-
 /* Wrap the code that we're going to delete after refactoring in this define*/
 #define REFACTORE_ME