Rework argument passing in analysis plugin

.travis.yml

@@ -73,6 +73,6 @@ matrix:
           name: "LongSoft/UEFITool"
           description: "UEFITool"
         notification_email: $NOTIFICATION_EMAIL
-        build_command_prepend: "NOBUILD=1 ./unixbuild.sh"
-        build_command: "PRECONFIGURED=1 ./unixbuild.sh"
+        build_command_prepend: "./unixbuild.sh --configure"
+        build_command: "./unixbuild.sh --build"
         branch_pattern: new_engine

unixbuild.sh

@@ -3,6 +3,12 @@
 UTARGET=$(uname)
 BINSUFFIX=""
 
+if [ "$1" = "--configure" ]; then
+  export NOBUILD=1
+elif [ "$1" = "--build" ]; then
+  export PRECONFIGURED=1
+fi
+
 if [ "$UTARGET" = "Darwin" ]; then
   export UPLATFORM="mac"
 elif [ "$UTARGET" = "Linux" ]; then