mongoose: don't install to target

Only a static library is built (and no _INSTALL_TARGET_CMDS are defined), so
there is no need to run the target-install step.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mongoose/mongoose.mk

@@ -9,6 +9,8 @@ MONGOOSE_SITE = $(call github,cesanta,mongoose,$(MONGOOSE_VERSION))
 MONGOOSE_LICENSE = GPL-2.0
 MONGOOSE_LICENSE_FILES = LICENSE
 MONGOOSE_INSTALL_STAGING = YES
+# static library
+MONGOOSE_INSTALL_TARGET = NO
 
 MONGOOSE_CFLAGS = $(TARGET_CFLAGS)