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[lib/c] Fix assert.h

According to C99 standard (section 7.2) the assert
macro shall be redefined each time assert.h gets
included depending on the status of NDEBUG macro.

--- a/lib/c/include/assert.h

+++ b/lib/c/include/assert.h

@@ -1,8 +1,7 @@

-#ifndef _ASSERT_H

-#define _ASSERT_H

 void __assert(char *exp, char *file, long line);

+#undef assert

 #ifndef NDEBUG

 # define assert(exp) ((exp) ? (void) 0 : __assert(#exp, __FILE__, __LINE__))

 #else

@@ -9,4 +8,3 @@

 # define assert(exp) ((void)0)

 #endif

-#endif