[klibc] Kbuild: Enable full debug information

Build all programs with full debug information (-ggdb).  We still
strip it away before installing by default.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
diff --git a/scripts/Kbuild.klibc b/scripts/Kbuild.klibc
index 5a4b71e..c32bc63 100644
--- a/scripts/Kbuild.klibc
+++ b/scripts/Kbuild.klibc
@@ -68,7 +68,8 @@
 
 KLIBCREQFLAGS     := $(call cc-option, -fno-stack-protector, ) \
                      $(call cc-option, -fwrapv, ) \
-                     $(call cc-option, -fno-PIE, )
+                     $(call cc-option, -fno-PIE, ) \
+                     -ggdb
 KLIBCARCHREQFLAGS :=
 KLIBCOPTFLAGS     :=
 KLIBCWARNFLAGS    := -W -Wall -Wno-sign-compare -Wno-unused-parameter