apvlv: fix build

Fixes #4760

srcpkgs/apvlv/patches/cxxflags_from_env.patch

@@ -0,0 +1,11 @@
+--- src/CMakeLists.txt.orig	2016-09-14 01:48:05.822928918 +0200
++++ src/CMakeLists.txt	2016-09-14 01:48:54.906931451 +0200
+@@ -1,7 +1,7 @@
+ IF (WIN32)
+   ADD_DEFINITIONS (-D_CRT_SECURE_NO_WARNINGS)
+ ELSE (WIN32)
+-  SET (CMAKE_CXX_FLAGS "-Wall -fno-strict-aliasing")
++  SET (CMAKE_CXX_FLAGS "-Wall -fno-strict-aliasing ${CMAKE_CXX_FLAGS}")
+ 
+   OPTION (APVLV_ENABLE_DEBUG "If build binary with debug infomations." OFF)
+   IF (APVLV_ENABLE_DEBUG)

srcpkgs/apvlv/template

@@ -1,7 +1,7 @@
 # Template file for 'apvlv'
 pkgname=apvlv
 version=0.1.5
-revision=1
+revision=2
 build_style=cmake
 configure_args="-DAPVLV_WITH_UMD=no -DAPVLV_WITH_DJVU=yes -DAPVLV_WITH_TXT=yes"
 hostmakedepends="cmake pkg-config"