tcc: re-enable correct option -r support

Forgot about it.  It allows to compile several
sources (and other .o's) to one single .o file;

    tcc -r -o all.o f1.c f2.c f3.S o4.o ...

Also:
- option -fold-struct-init-code removed, no effect anymore
- (tcc_)set_environment() moved to tcc.c
- win32/lib/(win)crt1 minor fix & add dependency
- debug line output for asm (tcc -c -g xxx.S) enabled
- configure/Makefiles: x86-64 -> x86_64 changes
- README: cleanup

tcc.c

@@ -104,9 +104,8 @@ static const char help2[] =
     "  signed-char                   default char is signed\n"
     "  common                        use common section instead of bss\n"
     "  leading-underscore            decorate extern symbols\n"
-    "  ms-extensions                 allow struct w/o identifier\n"
+    "  ms-extensions                 allow anonymous struct in struct\n"
     "  dollars-in-identifiers        allow '$' in C symbols\n"
-    "  old-struct-init-code          some hack for parsing initializers\n"
     "-m... target specific options:\n"
     "  ms-bitfields                  use MSVC bitfield layout\n"
 #ifdef TCC_TARGET_ARM
@@ -151,32 +150,18 @@ static const char version[] =
         "C67"
 #elif defined TCC_TARGET_ARM
         "ARM"
-# ifdef TCC_ARM_HARDFLOAT
-        " Hard Float"
-# endif
 #elif defined TCC_TARGET_ARM64
         "AArch64"
-# ifdef TCC_ARM_HARDFLOAT
+#endif
+#ifdef TCC_ARM_HARDFLOAT
         " Hard Float"
-# endif
 #endif
 #ifdef TCC_TARGET_PE
         " Windows"
-#elif defined(__APPLE__)
-        /* Current Apple OS name as of 2016 */
-        " macOS"
 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
         " FreeBSD"
-#elif defined(__DragonFly__)
-        " DragonFly BSD"
-#elif defined(__NetBSD__)
-        " NetBSD"
-#elif defined(__OpenBSD__)
-        " OpenBSD"
-#elif defined(__linux__)
-        " Linux"
 #else
-        " Unidentified system"
+        " Linux"
 #endif
     ")\n"
     ;
@@ -201,6 +186,24 @@ static void print_search_dirs(TCCState *s)
 #endif
 }
 
+static void set_environment(TCCState *s)
+{
+    char * path;
+
+    path = getenv("C_INCLUDE_PATH");
+    if(path != NULL) {
+        tcc_add_include_path(s, path);
+    }
+    path = getenv("CPATH");
+    if(path != NULL) {
+        tcc_add_include_path(s, path);
+    }
+    path = getenv("LIBRARY_PATH");
+    if(path != NULL) {
+        tcc_add_library_path(s, path);
+    }
+}
+
 static char *default_outputfile(TCCState *s, const char *first_file)
 {
     char buf[1024];
@@ -265,9 +268,6 @@ redo:
 #endif
         if (opt == OPT_V)
             return 0;
-
-        tcc_set_environment(s);
-
         if (opt == OPT_PRINT_DIRS) {
             /* initialize search dirs */
             tcc_set_output_type(s, TCC_OUTPUT_MEMORY);
@@ -287,8 +287,8 @@ redo:
                 if (!s->ppfp)
                     tcc_error("could not write '%s'", s->outfile);
             }
-        } else if (s->output_type == TCC_OUTPUT_OBJ) {
-            if (s->nb_libraries != 0 && !s->option_r)
+        } else if (s->output_type == TCC_OUTPUT_OBJ && !s->option_r) {
+            if (s->nb_libraries)
                 tcc_error("cannot specify libraries with -c");
             if (n > 1 && s->outfile)
                 tcc_error("cannot specify output file with -c many files");
@@ -301,6 +301,7 @@ redo:
             start_time = getclock_ms();
     }
 
+    set_environment(s);
     if (s->output_type == 0)
         s->output_type = TCC_OUTPUT_EXE;
     tcc_set_output_type(s, s->output_type);
@@ -323,7 +324,8 @@ redo:
         }
         s->filetype = 0;
         s->alacarte_link = 1;
-        if (ret || --n == 0 || s->output_type == TCC_OUTPUT_OBJ)
+        if (ret || --n == 0
+            || (s->output_type == TCC_OUTPUT_OBJ && !s->option_r))
             break;
     }