Misc. fixes

Makefile :
- do not 'uninstall' peoples /usr/local/doc entirely
libtcc.c :
- MEM_DEBUG : IDE-friendly output "file:line: ..."
- always ELF for objects
tccgen.c :
- fix memory leak in new switch code
- move static 'in_sizeof' out of function
profiling :
- define 'static' to empty
resolve_sym() :
- replace by dlsym()

win32/64: fix R_XXX_RELATIVE fixme
- was fixed for i386 already in
  8e4d64be2f
- do not -Lsystemdir if compiling to .o

tcc.h

@@ -76,6 +76,7 @@
 #  pragma warning (disable : 4018)  // signed/unsigned mismatch
 #  pragma warning (disable : 4146)  // unary minus operator applied to unsigned type, result still unsigned
 # endif
+# undef CONFIG_TCC_STATIC
 #endif
 
 #ifndef O_BINARY
@@ -1052,6 +1053,10 @@ static inline int toup(int c)
 # define PUB_FUNC
 #endif
 
+#ifdef TCC_PROFILE /* profile all functions */
+# define static
+#endif
+
 #ifdef ONE_SOURCE
 #define ST_INLN static inline
 #define ST_FUNC static
@@ -1559,9 +1564,7 @@ ST_FUNC void pe_add_unwind_data(unsigned start, unsigned end, unsigned stack);
 ST_FUNC void *dlopen(const char *filename, int flag);
 ST_FUNC void dlclose(void *p);
 ST_FUNC const char *dlerror(void);
-ST_FUNC void *resolve_sym(TCCState *s1, const char *symbol);
-#elif !defined _WIN32
-ST_FUNC void *resolve_sym(TCCState *s1, const char *symbol);
+ST_FUNC void *dlsym(int flag, const char *symbol);
 #endif
 
 #ifdef CONFIG_TCC_BACKTRACE