Travis config: put all cmake stuff to script section.

.travis.yml

@@ -12,11 +12,8 @@ compiler:
   - gcc
   - clang
 
-before_script:
-   cmake -G "Unix Makefiles" -DASSIMP_ENABLE_BOOST_WORKAROUND=YES
-
 script:
-  if [ "${COVERITY_SCAN_BRANCH}" != 1 ]; then make ; fi
+  cmake -G "Unix Makefiles" -DASSIMP_ENABLE_BOOST_WORKAROUND=YES; make
 
 addons:
   coverity_scan: