liblzma: Minor comment edits.

(cherry picked from commit 3217b82b3e)

src/liblzma/common/string_conversion.c

@@ -218,8 +218,8 @@ typedef struct {
 	uint16_t offset;
 
 	union {
-// NVHPC has problems with unions that contain pointers that are not the first
-// members
+		// NVHPC has problems with unions that contain pointers that
+		// are not the first members, so keep "map" at the top.
 		const name_value_map *map;
 
 		struct {

src/liblzma/delta/delta_decoder.c

@@ -26,6 +26,8 @@ decode_buffer(lzma_delta_coder *coder, uint8_t *buffer, size_t size)
 }
 
 
+// For an unknown reason NVIDIA HPC Compiler needs this pragma
+// to produce working code.
 #ifdef __NVCOMPILER
 #	pragma routine novector
 #endif