compiler_wrapper: Fix gcc host wrapper config

GCC host wrapper was not calling the code to add common
flags for no clear reason. Add it so that "-fcommon" is now
passed to GCC host compiler invocations.

BUG=chromium:1171833
TEST=go test

Change-Id: Id354b65ff0a08d0b25f895bb95cd4e99412b856b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2657585
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
diff --git a/compiler_wrapper/compiler_wrapper.go b/compiler_wrapper/compiler_wrapper.go
index 631f80f..0574f3c 100644
--- a/compiler_wrapper/compiler_wrapper.go
+++ b/compiler_wrapper/compiler_wrapper.go
@@ -219,9 +219,7 @@
 		processSysrootFlag(builder)
 	}
 	builder.addPreUserArgs(builder.cfg.gccFlags...)
-	if !builder.cfg.isHostWrapper {
-		calcCommonPreUserArgs(builder)
-	}
+	calcCommonPreUserArgs(builder)
 	processGccFlags(builder)
 	if !builder.cfg.isHostWrapper {
 		allowCCache := true