Add FLAC__ prefix to precompute_partition_info_sums....

Most non-static functions have FLAC__ prefix, but they were missing
from the precompute_partition_info_sums_* functions.

Patch-from: lvqcl <lvqcl.mail@gmail.com>
diff --git a/src/libFLAC/stream_encoder_intrin_sse2.c b/src/libFLAC/stream_encoder_intrin_sse2.c
index 406ae73..ac2e69f 100644
--- a/src/libFLAC/stream_encoder_intrin_sse2.c
+++ b/src/libFLAC/stream_encoder_intrin_sse2.c
@@ -42,7 +42,7 @@
 #include "FLAC/assert.h"
 #include "private/stream_encoder.h"
 
-void precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
+void FLAC__precompute_partition_info_sums_intrin_sse2(const FLAC__int32 residual[], FLAC__uint64 abs_residual_partition_sums[],
 		unsigned residual_samples, unsigned predictor_order, unsigned min_partition_order, unsigned max_partition_order, unsigned bps)
 {
 	const unsigned default_partition_samples = (residual_samples + predictor_order) >> max_partition_order;