Use STYLE macro semantics like other includes

Author: kbowers-jump

program/src/oracle/util/compat_stdint.h

@@ -1,14 +1,28 @@
 #ifndef _pyth_oracle_util_compat_stdint_h_
 #define _pyth_oracle_util_compat_stdint_h_
 
-/* solana uses its own definitions for stdint types and that can cause
-   problems with compilation */
+/* Include functionality from <stdint.h>.  Define
+   PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE to indicate how to do this:
+     0 - Use stdint.h directly
+     1 - Use solana_sdk.h (solana uses its own definitions for stdint
+         types and that can conflicts with stdint.h)
+   Defaults to 0 or 1 depending on if __bpf__ is set. */
 
-#ifdef __bpf__
+#ifndef PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE
+#ifndef __bpf__
+#define PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE 0
+#else
+#define PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE 1
+#endif
+#endif
+
+#if PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE==0
+#include <stdint.h>
+#elif PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE==1
 #include <solana_sdk.h>
 typedef uint64_t uintptr_t;
 #else
-#include <stdint.h>
+#error "Unsupported PYTH_ORACLE_UTIL_COMPAT_STDINT_STYLE"
 #endif
 
 #endif /* _pyth_oracle_util_compat_stdint_h_ */