Autotools: Fix tidy library checks

When configuring with tidy library installed in non-standard paths, the
library adding macro must be done before the PHP_CHECK_LIBRARY to be
able to detect it. This fixes these edge cases. For example:

    ./configure --with-tidy=/path/to/custom-tidy-installation

Author: petk

ext/tidy/config.m4

@@ -34,13 +34,17 @@ if test "$PHP_TIDY" != "no"; then
     [AC_DEFINE([HAVE_TIDYBUFFIO_H], [1],
       [Define to 1 if you have the <tidybuffio.h> header file.])])
 
-  TIDY_LIBDIR=$TIDY_DIR/$PHP_LIBDIR
   AS_VAR_IF([TIDY_LIB_NAME], [tidyp],
     [AC_DEFINE([HAVE_TIDYP_H], [1],
       [Define to 1 if you have the <tidyp.h> header file.])],
     [AC_DEFINE([HAVE_TIDY_H], [1],
       [Define to 1 if you have the <tidy.h> header file.])])
 
+  PHP_ADD_LIBRARY_WITH_PATH([$TIDY_LIB_NAME],
+    [$TIDY_DIR/$PHP_LIBDIR],
+    [TIDY_SHARED_LIBADD])
+  PHP_ADD_INCLUDE([$TIDY_INCDIR])
+
   PHP_CHECK_LIBRARY([$TIDY_LIB_NAME], [tidyOptGetDoc],
     [AC_DEFINE([HAVE_TIDYOPTGETDOC], [1],
       [Define to 1 if Tidy library has the 'tidyOptGetDoc' function.])],
@@ -52,11 +56,6 @@ if test "$PHP_TIDY" != "no"; then
     [AC_DEFINE([HAVE_TIDYRELEASEDATE], [1],
       [Define to 1 if Tidy library has the 'tidyReleaseDate' function.])])
 
-  PHP_ADD_LIBRARY_WITH_PATH([$TIDY_LIB_NAME],
-    [$TIDY_LIBDIR],
-    [TIDY_SHARED_LIBADD])
-  PHP_ADD_INCLUDE([$TIDY_INCDIR])
-
   dnl Add -Wno-ignored-qualifiers as this is an issue upstream
   TIDY_COMPILER_FLAGS="$TIDY_CFLAGS -Wno-ignored-qualifiers -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1"
   PHP_NEW_EXTENSION([tidy], [tidy.c], [$ext_shared],, [$TIDY_COMPILER_FLAGS])