Merge branch 'dd/sparse-glibc-workaround'

This is Exhibit A to make the case that maintenance is always required,
a software is never "done".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

Author: dscho

Makefile

@@ -1420,7 +1420,7 @@ ARFLAGS = rcs
 PTHREAD_CFLAGS =
 
 # For the 'sparse' target
-SPARSE_FLAGS ?= -std=gnu99
+SPARSE_FLAGS ?= -std=gnu99 -D__STDC_NO_VLA__
 SP_EXTRA_FLAGS =
 
 # For informing GIT-BUILD-OPTIONS of the SANITIZE=leak,address targets