[source] comgt: allow build without USB_SUPPORT

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/fbe522d1204149b6c128d55e360bfc15fa8258e1

commit fbe522d1204149b6c128d55e360bfc15fa8258e1
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed Jan 11 18:06:06 2017 +0100

    comgt: allow build without USB_SUPPORT
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/network/utils/comgt/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/network/utils/comgt/Makefile b/package/network/utils/comgt/Makefile
index 9ddc617..2b39de6 100644
--- a/package/network/utils/comgt/Makefile
+++ b/package/network/utils/comgt/Makefile
@@ -39,7 +39,7 @@ endef
 define Package/comgt-directip
 $(call Package/comgt/Default)
   TITLE:=Sierra Wireless Direct-IP support
-  DEPENDS:=+comgt +kmod-usb-serial +kmod-usb-serial-sierrawireless +kmod-usb-net +kmod-usb-net-sierrawireless
+  DEPENDS:=+comgt +USB_SUPPORT:kmod-usb-serial +USB_SUPPORT:kmod-usb-serial-sierrawireless +USB_SUPPORT:kmod-usb-net +USB_SUPPORT:kmod-usb-net-sierrawireless
 endef
 
 define Package/comgt-ncm