Revert earliest to gcc-4.8, compile iverilog with default compiler

.travis.yml

@@ -18,7 +18,7 @@ matrix:
       addons:
         apt:
           packages:
-            - g++-4.9
+            - g++-4.8
             - gperf
             - build-essential
             - bison
@@ -37,7 +37,7 @@ matrix:
             - libboost-python-dev
             - libboost-filesystem-dev
       env:
-        - MATRIX_EVAL="CONFIG=gcc && CC=gcc-4.9 && CXX=g++-4.9"
+        - MATRIX_EVAL="CONFIG=gcc && CC=gcc-4.8 && CXX=g++-4.8"
 
     # Latest gcc supported on Travis Linux
     - os: linux

.travis/setup.sh

@@ -51,7 +51,7 @@ fi
 		git clone git://github.com/steveicarus/iverilog.git
 		cd iverilog
 		autoconf
-		./configure --prefix=$HOME/.local-bin
+		CC=gcc CXX=g++ ./configure --prefix=$HOME/.local-bin
 		make
 		make install
 		echo