add missing FLAGS for pecl

templates/config.m4.template

@@ -13,8 +13,8 @@
 
     LIBS="-lpthread $LIBS"
 
-    CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11"
-    CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti"
+    CFLAGS="-Wall -Werror -Wno-parentheses-equality -Wno-unused-value -std=c11 -g -O2"
+    CXXFLAGS="-std=c++11 -fno-exceptions -fno-rtti -g -O2"
     GRPC_SHARED_LIBADD="-lpthread $GRPC_SHARED_LIBADD"
     PHP_REQUIRE_CXX()
     PHP_ADD_LIBRARY(pthread)