Remove -DREENTRANT because it's not needed right now

src/Makefile.am

@@ -1,8 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
 AUTOMAKE_OPTIONS = subdir-objects
 
-AM_CFLAGS += -I../include/ -std=c99 -DREENTRANT -lpthread
-AM_LDFLAGS += -lpthread
+AM_CFLAGS += -I../include/ -std=c99
+AM_LDFLAGS +=
 
 TR_HASH = hexdecode.c \
 	  hexencode.c \
@@ -23,7 +23,7 @@ lib_LTLIBRARIES = libtrhashing.la
 bin_PROGRAMS = trsha1speed trencodespeed
 
 libtrhashing_la_SOURCES = $(TR_HASH)
-libtrhashing_la_CFLAGS  = $(AM_CFLAGS) -std=c99 $(OPENSSL)
+libtrhashing_la_CFLAGS  = $(AM_CFLAGS) $(OPENSSL)
 libtrhashing_la_LIBADD  =
 libtrhashing_la_LDFLAGS = -version-info 0:0:0 $(AM_LDFLAGS)