Add patch to CI so we can use include files outside the system include directory

.travis.yml

@@ -121,7 +121,7 @@ before_install:
 before_script:
   - export LD_LIBRARY_PATH=${TRAVIS_BUILD_DIR}/usr/lib:$LD_LIBRARY_PATH
   - export PKG_CONFIG_PATH=${TRAVIS_BUILD_DIR}/usr/lib/pkgconfig:$PKG_CONFIG_PATH
-  - cat ${TRAVIS_BUILD_DIR}/usr/lib/pkgconfig/poppler.pc
+  - patch < CMakeLists.txt.patch
   - mkdir build && cd build && cmake -DENABLE_SVG=ON -DCMAKE_INSTALL_PREFIX=${TRAVIS_BUILD_DIR}/usr ..
 
 script:

CMakeLists.txt.patch

@@ -0,0 +1,12 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 135e02f..97c7035 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -7,6 +7,7 @@ cmake_minimum_required(VERSION 2.6.0 FATAL_ERROR)
+ 
+ option(ENABLE_SVG "Enable SVG support, for generating SVG background images and converting Type 3 fonts" ON)
+ 
++include_directories(${CMAKE_INSTALL_PREFIX}/include)
+ include_directories(${CMAKE_SOURCE_DIR}/src)
+ 
+ set(PDF2HTMLEX_VERSION "0.15.0")