Fixes errors such as:

GEGL-Message: 16:04:13.794: Module '/usr/lib/gegl-0.4/raw-load.so' load error: Error relocating /usr/lib/libgomp.so.1: __cxa_finalize: initial-exec TLS resolves to dynamic definition in /usr/lib/libgomp.so.1

--- a/libgomp/configure.tgt	2018-11-08 18:13:04.000000000 +0100
+++ b/libgomp/configure.tgt	2019-06-29 20:06:31.972950350 +0200
@@ -10,23 +10,6 @@
 #  XCFLAGS		Add extra compile flags to use.
 #  XLDFLAGS		Add extra link flags to use.
 
-# Optimize TLS usage by avoiding the overhead of dynamic allocation.
-if test $gcc_cv_have_tls = yes ; then
-  case "${target}" in
-
-    *-*-k*bsd*-gnu*)
-	;;
-
-    *-*-linux* | *-*-gnu*)
-	XCFLAGS="${XCFLAGS} -ftls-model=initial-exec -DUSING_INITIAL_EXEC_TLS"
-	;;
-
-    *-*-rtems*)
-	XCFLAGS="${XCFLAGS} -ftls-model=local-exec"
-	;;
-  esac
-fi
-
 # Since we require POSIX threads, assume a POSIX system by default.
 config_path="posix"