fix extension loading

Author: paleolimbot

c/driver/sqlite/CMakeLists.txt

@@ -27,9 +27,14 @@ endif()
 
 # Check for sqlite3_load_extension() in sqlite3.h
 if(EXISTS "${SQLite3_INCLUDE_DIRS}/sqlite3.h")
-  file(READ "${SQLite3_INCLUDE_DIRS}/sqlite3.h" ADBC_SQLITE_H_CONTENT)
   string(FIND "${ADBC_SQLITE_H_CONTENT}" "sqlite3_load_extension"
-              ADBC_SQLITE_WITH_LOAD_EXTENSION)
+              ADBC_SQLITE3_LOAD_EXTENSION_POS)
+
+  if(ADBC_SQLITE3_LOAD_EXTENSION_POS EQUAL -1)
+    set(ADBC_SQLITE_WITH_LOAD_EXTENSION OFF)
+  else()
+    set(ADBC_SQLITE_WITH_LOAD_EXTENSION ON)
+  endif()
 endif()
 
 if(NOT ADBC_SQLITE_WITH_LOAD_EXTENSION)