build: Add libffi as a build dependency on linux.

build/install-build-deps.sh

Index: build/install-build-deps.sh
diff --git a/build/install-build-deps.sh b/build/install-build-deps.sh
index 1fcd851ce38b9661f22829edce2c3c3fffe15fe7..cb5ec2001750668710ee90d941208016a81b0acc 100755
--- a/build/install-build-deps.sh
+++ b/build/install-build-deps.sh
@@ -102,16 +102,16 @@ dev_list="apache2.2-bin bison cdbs curl dpkg-dev elfutils devscripts fakeroot
           language-pack-fr language-pack-he language-pack-zh-hant
           libapache2-mod-php5 libasound2-dev libbrlapi-dev libav-tools
           libbz2-dev libcairo2-dev libcap-dev libcups2-dev libcurl4-gnutls-dev
-          libdrm-dev libelf-dev libexif-dev libgconf2-dev libglib2.0-dev
-          libglu1-mesa-dev libgnome-keyring-dev libgtk2.0-dev libkrb5-dev
-          libnspr4-dev libnss3-dev libpam0g-dev libpci-dev libpulse-dev
-          libsctp-dev libspeechd-dev libsqlite3-dev libssl-dev libudev-dev
-          libwww-perl libxslt1-dev libxss-dev libxt-dev libxtst-dev openbox
-          patch perl php5-cgi pkg-config python python-cherrypy3 python-crypto
-          python-dev python-numpy python-opencv python-openssl python-psutil
-          python-yaml rpm ruby subversion ttf-dejavu-core ttf-indic-fonts
-          ttf-kochi-gothic ttf-kochi-mincho wdiff xfonts-mathml zip
-          $chromeos_dev_list"
+          libdrm-dev libelf-dev libexif-dev libffi-dev libgconf2-dev
+          libglib2.0-dev libglu1-mesa-dev libgnome-keyring-dev libgtk2.0-dev
+          libkrb5-dev libnspr4-dev libnss3-dev libpam0g-dev libpci-dev
+          libpulse-dev libsctp-dev libspeechd-dev libsqlite3-dev libssl-dev
+          libudev-dev libwww-perl libxslt1-dev libxss-dev libxt-dev libxtst-dev
+          openbox patch perl php5-cgi pkg-config python python-cherrypy3
+          python-crypto python-dev python-numpy python-opencv python-openssl
+          python-psutil python-yaml rpm ruby subversion ttf-dejavu-core
+          ttf-indic-fonts ttf-kochi-gothic ttf-kochi-mincho wdiff xfonts-mathml
+          zip $chromeos_dev_list"
 
 # 64-bit systems need a minimum set of 32-bit compat packages for the pre-built
 # NaCl binaries.
@@ -124,15 +124,15 @@ chromeos_lib_list="libpulse0 libbz2-1.0"
 
 # Full list of required run-time libraries
 lib_list="libatk1.0-0 libc6 libasound2 libcairo2 libcap2 libcups2 libexpat1
-          libexif12 libfontconfig1 libfreetype6 libglib2.0-0 libgnome-keyring0
-          libgtk2.0-0 libpam0g libpango1.0-0 libpci3 libpcre3 libpixman-1-0
-          libpng12-0 libspeechd2 libstdc++6 libsqlite3-0 libx11-6
+          libexif12 libffi6 libfontconfig1 libfreetype6 libglib2.0-0
+          libgnome-keyring0 libgtk2.0-0 libpam0g libpango1.0-0 libpci3 libpcre3
+          libpixman-1-0 libpng12-0 libspeechd2 libstdc++6 libsqlite3-0 libx11-6
           libxau6 libxcb1 libxcomposite1 libxcursor1 libxdamage1 libxdmcp6
           libxext6 libxfixes3 libxi6 libxinerama1 libxrandr2 libxrender1
           libxtst6 zlib1g $chromeos_lib_list"
 
 # Debugging symbols for all of the run-time libraries
-dbg_list="libatk1.0-dbg libc6-dbg libcairo2-dbg libfontconfig1-dbg
+dbg_list="libatk1.0-dbg libc6-dbg libcairo2-dbg libffi6-dbg libfontconfig1-dbg
           libglib2.0-0-dbg libgtk2.0-0-dbg libpango1.0-0-dbg libpcre3-dbg
           libpixman-1-0-dbg libsqlite3-0-dbg libx11-6-dbg libxau6-dbg
           libxcb1-dbg libxcomposite1-dbg libxcursor1-dbg libxdamage1-dbg