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Document HAVE_LRINTF in the draft Makefile.

I've changed the grouping of the options to place the performance-
related ones after the more serious thread-safety options. This
is still somewhat confusing as with C99 on wants -DHAVE_LRINTF
but NOT -Drestrict=

I've also added leading whitespace to the comment lines to better
distinguish them from the commented-out code lines.

--- a/Makefile.draft

+++ b/Makefile.draft

@@ -1,17 +1,20 @@

 #################### COMPILE OPTIONS #######################

-#Uncomment this for fixed-point build

+# Uncomment this for fixed-point build

 #FIXED_POINT=1

-#If you have a C99 compiler, you don't need this

-CFLAGS += -Drestrict= 

-

-#It is strongly recommended to uncomment one of these

-#VAR_ARRAYS: Use C99 variable-length arrays for stack allocation

-#USE_ALLOCA: Use alloca() for stack allocation

-#If none is defined, then the fallback is a non-threadsafe global array

+# It is strongly recommended to uncomment one of these

+# VAR_ARRAYS: Use C99 variable-length arrays for stack allocation

+# USE_ALLOCA: Use alloca() for stack allocation

+# If none is defined, then the fallback is a non-threadsafe global array

 #CFLAGS += -DUSE_ALLOCA

 #CFLAGS += -DVAR_ARRAYS

+

+# These options affect performance

+# HAVE_LRINTF: Use C99 intrinsics to speed up float-to-int conversion

+# restrict: Don't use the 'restrict' optimization (for pre-C99 compilers)

+#CFLAGS += -DHAVE_LRINTF

+CFLAGS += -Drestrict=

 ###################### END OF OPTIONS ######################