Unify struct names and tags

src/prng/xorshift/xorshift.c

@@ -7,8 +7,8 @@
 #include <stdlib.h>
 #include <time.h>
 
-typedef struct split_mix_64_state SplitMix64State;
-struct split_mix_64_state {
+typedef struct SplitMix64State SplitMix64State;
+struct SplitMix64State {
 	u64 seed;
 };
 

src/prng/xorshift/xorshift.h

@@ -10,8 +10,8 @@
 BEGIN_C_LINKAGE
 #endif // !WAPP_PLATFORM_CPP
 
-typedef struct xor_256_state XOR256State;
-struct xor_256_state {
+typedef struct XOR256State XOR256State;
+struct XOR256State {
 	u64 x;
 	u64 y;
 	u64 z;