PHP: fix distribtest test by adding -Ithird_party/nanopb
diff --git a/config.m4 b/config.m4
index 781fd08..29f293f 100644
--- a/config.m4
+++ b/config.m4
@@ -9,11 +9,12 @@
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/src/php/ext/grpc)
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/boringssl/include)
   PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/address_sorting/include)
+  PHP_ADD_INCLUDE(PHP_EXT_SRCDIR()/third_party/nanopb)
 
   LIBS="-lpthread $LIBS"
 
-  CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11 -g -O2 -D PB_FIELD_16BIT=1"
-  CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti -g -O2 -D PB_FIELD_16BIT=1"
+  CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11 -g -O2 -D PB_FIELD_32BIT=1"
+  CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti -g -O2 -D PB_FIELD_32BIT=1"
   GRPC_SHARED_LIBADD="-lpthread $GRPC_SHARED_LIBADD"
   PHP_REQUIRE_CXX()
   PHP_ADD_LIBRARY(pthread)