Fix some #if guards

Author: staticfloat

src/deepbindless_surrogates.c

@@ -1,6 +1,6 @@
 #include "libblastrampoline_internal.h"
 
-#ifdef LBT_DEEPBINDLESS
+#if defined(LBT_DEEPBINDLESS)
 
 int lsame_idx = -1;
 const void *old_lsame32 = NULL, *old_lsame64 = NULL;

src/dl_utils.c

@@ -63,7 +63,7 @@ void close_library(void * handle) {
  * Look up the given symbol within the given library denoted by `handle`.
  */
 void * lookup_symbol(const void * handle, const char * symbol_name) {
-#ifdef _OS_WINDOWS_
+#if defined(_OS_WINDOWS_)
     return GetProcAddress((HMODULE) handle, symbol_name);
 #else
     return dlsym((void *)handle, symbol_name);

src/libblastrampoline.c

@@ -224,7 +224,7 @@ LBT_DLLEXPORT int32_t lbt_forward(const char * libname, int32_t clear, int32_t v
      * attempts to load another one without setting the `clear` flag, we refuse to
      * load it on a deepbindless system, printing out to `stderr` if we're verbose.
      */
-#if LBT_DEEPBINDLESS
+#if defined(LBT_DEEPBINDLESS)
     // If `clear` is set, we clear our tracking
     if (clear) {
         deepbindless_interfaces_loaded = 0x00;