[build] Use static libraries on x87 bot.

The bot currently doesn't work with shared libraries. This
temporarily works around the problem to get the bot green.

BUG=v8:5412
NOTRY=true
TBR=jochen, zhengxing.li, jgruber

Review-Url: https://codereview.chromium.org/2405243002
Cr-Commit-Position: refs/heads/master@{#40191}

infra/mb/mb_config.pyl

@@ -354,7 +354,8 @@
 
     # Gyp debug configs for simulators.
     'gyp_debug_simulate_x87_no_snap': [
-      'gyp', 'debug_bot', 'simulate_x87', 'swarming', 'v8_snapshot_none'],
+      'gyp', 'debug_bot_static', 'simulate_x87', 'swarming',
+      'v8_snapshot_none'],
 
     # Gyp debug configs for x86.
     'gyp_debug_x86': [
@@ -461,6 +462,12 @@
         'v8_optimized_debug'],
     },
 
+    'debug_bot_static': {
+      'mixins': [
+        'debug', 'static', 'goma', 'v8_enable_slow_dchecks',
+        'v8_optimized_debug'],
+    },
+
     'debug_trybot': {
       'mixins': ['debug_bot', 'minimal_symbols'],
     },