Bump buildroot to 2019.02

bsp/buildroot/package/php/0002-iconv-tweak-iconv-detection.patch

@@ -14,7 +14,7 @@ Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
 [Gustavo: convert to nice m4 instead of patching configure]
 [Gustavo: update for 5.6.10]
 Signed-off-by: Adam Duskett <aduskett@gmail.com>
-[aduskett@gmail.com: Update for 7.2.2]
+[aduskett@gmail.com: Update for 7.3.0]
 ---
  acinclude.m4        |  2 +-
  ext/iconv/config.m4 | 22 ----------------------
@@ -24,7 +24,7 @@ diff --git a/acinclude.m4 b/acinclude.m4
 index af4aa06..1bd2652 100644
 --- a/acinclude.m4
 +++ b/acinclude.m4
-@@ -2463,7 +2463,7 @@ AC_DEFUN([PHP_SETUP_ICONV], [
+@@ -2444,7 +2444,7 @@ AC_DEFUN([PHP_SETUP_ICONV], [
    dnl
    if test "$found_iconv" = "no"; then
  
@@ -34,10 +34,10 @@ index af4aa06..1bd2652 100644
          AC_DEFINE(HAVE_GICONV_H, 1, [ ])
          ICONV_DIR=$i
 diff --git a/ext/iconv/config.m4 b/ext/iconv/config.m4
-index 6a05697..694fcb8 100644
+index 72334f79..29c358ad 100644
 --- a/ext/iconv/config.m4
 +++ b/ext/iconv/config.m4
-@@ -14,28 +14,6 @@ if test "$PHP_ICONV" != "no"; then
+@@ -12,28 +12,6 @@ if test "$PHP_ICONV" != "no"; then
    ])
  
    if test "$iconv_avail" != "no"; then
@@ -65,7 +65,7 @@ index 6a05697..694fcb8 100644
 -	fi
  
      AC_MSG_CHECKING([if iconv is glibc's])
-     AC_TRY_LINK([#include <gnu/libc-version.h>],[gnu_get_libc_version();],
+     AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gnu/libc-version.h>]], [[gnu_get_libc_version();]])],[
 -- 
 2.7.4