debian/rules: Enable debug-silent by default for debug builds

Debug builds now use --enable-debug-silent so logging is compiled in but
silent by default. Users can activate logging at runtime via
WOLFPROV_LOG_LEVEL and WOLFPROV_LOG_COMPONENTS environment variables.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ColtonWilley

debian/rules

@@ -37,7 +37,7 @@ ifeq ($(WOLFPROV_DEBUG),1)
   VARIANT           := $(VARIANT)-debug
   VARIANT_DESC      := $(VARIANT_DESC) with debug logs
   VERSION           := $(VERSION)-debug
-  DEBUG_FLAG        := --enable-debug
+  DEBUG_FLAG        := --enable-debug --enable-debug-silent
 endif
 
 ifeq ($(DEB_CFLAGS_APPEND),)