archivers/snappy: Enable RTTI info

devel/folly is (silently) built with unresolved symbols because snappy disables RTTI info.
This later causes www/proxygen build failure.

PR:		256625
Approved by:	vanilla (maintainer)

archivers/snappy/Makefile

@@ -2,6 +2,7 @@
 
 PORTNAME=	snappy
 PORTVERSION=	1.1.9
+PORTREVISION=	1
 CATEGORIES=	archivers
 
 MAINTAINER=	vanilla@FreeBSD.org

archivers/snappy/files/patch-CMakeLists.txt

@@ -1,6 +1,19 @@
 --- CMakeLists.txt.orig	2021-05-04 22:53:34 UTC
 +++ CMakeLists.txt
-@@ -213,8 +213,7 @@ configure_file(
+@@ -78,8 +78,10 @@ else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
+ 
+   # Disable RTTI.
+-  string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
++  if (NOT CMAKE_SYSTEM_NAME MATCHES "FreeBSD") # devel/folly requires RTTI info, see https://github.com/facebook/folly/issues/1606
++    string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
++    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti")
++  endif()
+ endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
+ 
+ # BUILD_SHARED_LIBS is a standard CMake variable, but we declare it here to make
+@@ -213,8 +215,7 @@ configure_file(
    "snappy-stubs-public.h.in"
    "${PROJECT_BINARY_DIR}/snappy-stubs-public.h")
  
@@ -10,7 +23,7 @@
    PRIVATE
      "snappy-internal.h"
      "snappy-stubs-internal.h"
-@@ -235,20 +234,35 @@ target_sources(snappy
+@@ -235,20 +236,35 @@ target_sources(snappy
      $<BUILD_INTERFACE:${PROJECT_BINARY_DIR}/snappy-stubs-public.h>
      $<INSTALL_INTERFACE:include/snappy-stubs-public.h>
  )
@@ -50,7 +63,7 @@
  if(SNAPPY_BUILD_TESTS OR SNAPPY_BUILD_BENCHMARKS)
    add_library(snappy_test_support "")
    target_sources(snappy_test_support
-@@ -359,7 +373,7 @@ endif(SNAPPY_FUZZING_BUILD)
+@@ -359,7 +375,7 @@ endif(SNAPPY_FUZZING_BUILD)
  include(GNUInstallDirs)
  
  if(SNAPPY_INSTALL)