Bump buidlroot version to 2018.02.6

bsp/buildroot/package/php/0005-ext-fileinfo-config.m4-allow-cache-answer-for-strcas.patch

@@ -5,6 +5,8 @@ Subject: [PATCH] ext/fileinfo/config.m4: allow cache answer for strcasestr
  discovery
 
 Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+[aduskett@gmail.com: Update for 7.2.2]
+Signed-off-by: Adam Duskett <aduskett@gmail.com>
 ---
  ext/fileinfo/config.m4 | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)
@@ -13,14 +15,14 @@ diff --git a/ext/fileinfo/config.m4 b/ext/fileinfo/config.m4
 index 7e98d62..8561962 100644
 --- a/ext/fileinfo/config.m4
 +++ b/ext/fileinfo/config.m4
-@@ -14,6 +14,7 @@ if test "$PHP_FILEINFO" != "no"; then
-     libmagic/readcdf.c libmagic/softmagic.c"
+@@ -15,6 +15,7 @@ libmagic/readcdf.c libmagic/softmagic.c libmagic/der.c"
  
    AC_MSG_CHECKING([for strcasestr])
 +  AC_CACHE_VAL(ac_cv_func_strcasestr,
    AC_TRY_RUN([
  #include <string.h>
  #include <strings.h>
+ #include <stdlib.h>
 @@ -46,7 +47,7 @@ int main(void)
      AC_MSG_RESULT(no)
      AC_MSG_NOTICE(using libmagic strcasestr implementation)