Just assume ICONV_DIR is fine since we pass the correct parameters
to configure.
Otherwise configure will try to guess on absolute directories and
sometimes messes up on some weird edge conditions.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>

diff -Nura php-5.3.27.orig/configure php-5.3.27/configure
--- php-5.3.27.orig/configure	2013-11-26 09:33:30.874253800 -0300
+++ php-5.3.27/configure	2013-11-26 09:41:41.495363637 -0300
@@ -48212,20 +48212,7 @@
 
 
   if test "$iconv_avail" != "no"; then
-    if test -z "$ICONV_DIR"; then
-      for i in /usr/local /usr; do
-        if test -f "$i/include/iconv.h" || test -f "$i/include/giconv.h"; then
-          PHP_ICONV_PREFIX="$i"
-          break
-        fi
-      done
-      if test -z "$PHP_ICONV_PREFIX"; then
-        PHP_ICONV_PREFIX="/usr"
-      fi
-    else
-      PHP_ICONV_PREFIX="$ICONV_DIR"
-    fi
-
+    PHP_ICONV_PREFIX="$ICONV_DIR"
     CFLAGS="-I$PHP_ICONV_PREFIX/include $CFLAGS"
     LDFLAGS="-L$PHP_ICONV_PREFIX/$PHP_LIBDIR $LDFLAGS"