fixed minor compatibility issues with older compilers

contrib/largeNbDicts/Makefile

@@ -15,7 +15,7 @@ LIBZSTD = $(LIBDIR)/libzstd.a
 CPPFLAGS+= -I$(LIBDIR) -I$(LIBDIR)/common -I$(LIBDIR)/dictBuilder -I$(PROGDIR)
 
 CFLAGS  ?= -O3
-CFLAGS  += -std=c99
+CFLAGS  += -std=gnu99
 DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
             -Wstrict-aliasing=1 -Wswitch-enum \
             -Wstrict-prototypes -Wundef -Wpointer-arith -Wformat-security \

contrib/largeNbDicts/largeNbDicts.c

@@ -50,6 +50,8 @@
 
 /*---  Macros  ---*/
 #define CONTROL(c)   assert(c)
+#undef MIN
+#define MIN(a,b)   ((a) < (b) ? (a) : (b))
 
 
 /*---  Display Macros  ---*/
@@ -472,9 +474,6 @@ static size_t compressBlocks(size_t* cSizes,   /* optional (can be NULL). If pre
 
 /* ---  Benchmark  --- */
 
-typedef size_t (*BMK_benchFn_t)(const void* src, size_t srcSize, void* dst, size_t dstCapacity, void* customPayload);
-typedef size_t (*BMK_initFn_t)(void* initPayload);
-
 typedef struct {
     ZSTD_DCtx* dctx;
     size_t nbDicts;