[build] remove m4 AC_PATH_PROG for PKG_CONFIG
replaced by PKG_PROG_PKG_CONFIG and PKG_CHECK_MODULES()
@@ -170,9 +170,6 @@ LIBS=$save_LIBS
AC_SUBST([DL_LIB])
dnl prepare pkg-config usage below
-if test -z "$PKG_CONFIG"; then
- AC_PATH_PROG([PKG_CONFIG], [pkg-config], [no])
-fi
PKG_PROG_PKG_CONFIG
dnl checking for libev
