fix tslib version check in configure.in

The patch makes sure that the old as well as the new tslib pkg-config
metadata file naming style is handled correctly.

tslib 0.0 to 1.0 created only a tslib-<VERSION>.pc pkg-config metadata
file.

With tslib 1.1 the tslib-<VERSION>.pc phase out was started.
Additionally, the pkg-config metadata file tslib.pc was added.

Since tslib 1.6 the tslib-<VERSION>.pc metadata file is deprecated.
Now, there is only a tslib.pc.

Upstream-Status: Inappropriate [no upstream]
Signed-off-by: Ben Guan <ben.guan@cn.bosch.com>
Signed-off-by: Mark Jonas <mark.jonas@de.bosch.com>

diff -Nru DirectFB-1.7.7.orig/configure.in DirectFB-1.7.7/configure.in
--- DirectFB-1.7.7.orig/configure.in	2015-02-10 01:16:46.000000000 +0800
+++ DirectFB-1.7.7/configure.in	2018-06-06 17:19:18.472143103 +0800
@@ -2459,10 +2459,13 @@
 
 enable_tslib=no
 if test "$checkfor_tslib" = "yes"; then
-  PKG_CHECK_MODULES([TSLIB], [tslib-1.0 >= 1.0.0], [enable_tslib=yes], [enable_tslib=no])
+  PKG_CHECK_MODULES([TSLIB], [tslib >= 1.1], [enable_tslib=yes], [enable_tslib=no])
   if test "$enable_tslib" = "no"; then
-     PKG_CHECK_MODULES([TSLIB], [tslib-0.0], [enable_tslib=yes], [enable_tslib=no
-       AC_MSG_WARN([*** no tslib -- tslib driver will not be built.])])
+    PKG_CHECK_MODULES([TSLIB], [tslib-1.0 >= 1.0], [enable_tslib=yes], [enable_tslib=no])
+    if test "$enable_tslib" = "no"; then
+      PKG_CHECK_MODULES([TSLIB], [tslib-0.0], [enable_tslib=yes], [enable_tslib=no
+        AC_MSG_WARN([*** no tslib -- tslib driver will not be built.])])
+    fi
   fi
 fi