Fix bashism and force GStreamer 1.x support

--- configure.orig	2020-03-08 02:42:31 UTC
+++ configure
@@ -20993,7 +20993,7 @@ then
 
     loop=${enable_monitors},
 
-    while echo $loop | grep \, &> /dev/null
+    while echo $loop | grep -q \,
     do
         monitor=${loop%%\,*}
         loop=${loop#*\,}
@@ -24438,44 +24438,9 @@ config_gstreamer=no
 if test "x$enable_gstreamer" != "xno";
 then
 
-pkg_failed=no
+pkg_failed=yes
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GSTREAMER" >&5
 $as_echo_n "checking for GSTREAMER... " >&6; }
-
-if test -n "$GSTREAMER_CFLAGS"; then
-    pkg_cv_GSTREAMER_CFLAGS="$GSTREAMER_CFLAGS"
- elif test -n "$PKG_CONFIG"; then
-    if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"gstreamer-0.10\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "gstreamer-0.10") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  pkg_cv_GSTREAMER_CFLAGS=`$PKG_CONFIG --cflags "gstreamer-0.10" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes
-else
-  pkg_failed=yes
-fi
- else
-    pkg_failed=untried
-fi
-if test -n "$GSTREAMER_LIBS"; then
-    pkg_cv_GSTREAMER_LIBS="$GSTREAMER_LIBS"
- elif test -n "$PKG_CONFIG"; then
-    if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"gstreamer-0.10\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "gstreamer-0.10") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  pkg_cv_GSTREAMER_LIBS=`$PKG_CONFIG --libs "gstreamer-0.10" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes
-else
-  pkg_failed=yes
-fi
- else
-    pkg_failed=untried
-fi