[cron] force arch to v7ve, which is v7a+virt aka A15, to avoid bad gcc driver choices

Change-Id: I449e8810c227129335f273acee8f89cd8174424f
diff --git a/helpers/llvm-cron-build b/helpers/llvm-cron-build
index 4751946..114c1ae 100755
--- a/helpers/llvm-cron-build
+++ b/helpers/llvm-cron-build
@@ -57,12 +57,12 @@
 # Update compiler flags
 case $1 in
   arm)
-    CFLAGS="$CFLAGS -mcpu=cortex-a15 -marm"
-    CXXFLAGS="$CXXFLAGS -mcpu=cortex-a15 -marm"
+    CFLAGS="$CFLAGS -march=armv7ve -mcpu=cortex-a15 -marm"
+    CXXFLAGS="$CXXFLAGS -march=armv7ve -mcpu=cortex-a15 -marm"
     ;;
   thumb)
-    CFLAGS="$CFLAGS -mcpu=cortex-a15 -mthumb"
-    CXXFLAGS="$CXXFLAGS -mcpu=cortex-a15 -mthumb"
+    CFLAGS="$CFLAGS -march=armv7ve -mcpu=cortex-a15 -mthumb"
+    CXXFLAGS="$CXXFLAGS -march=armv7ve -mcpu=cortex-a15 -mthumb"
     ;;
   *)
     ;;