Move externs to header files

Follow Linux kernel coding style.

Remove exception from checkpatch.pl configuration file.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

src/asm/fstack.c

@@ -12,6 +12,7 @@
 #include "asm/fstack.h"
 #include "asm/lexer.h"
 #include "asm/main.h"
+#include "asm/output.h"
 #include "asm/symbol.h"
 
 #include "extern/err.h"
@@ -35,9 +36,6 @@ static uint32_t nCurrentREPTBlockCount;
 
 uint32_t ulMacroReturnValue;
 
-extern char *tzObjectname;
-extern FILE *dependfile;
-
 /*
  * defines for nCurrentStatus
  */

src/asm/globlex.c

@@ -460,8 +460,7 @@ const struct sLexFloat tMacroUniqueToken = {
 	T_LEX_MACROUNIQUE
 };
 
-void
-setuplex(void)
+void setup_lexer(void)
 {
 	uint32_t id;
 

src/asm/lexer.c

@@ -28,8 +28,6 @@ struct sLexString {
 
 #define SAFETYMARGIN		1024
 
-extern size_t symvaluetostring(char *dest, size_t maxLength, char *sym);
-
 struct sLexFloat tLexFloat[32];
 struct sLexString *tLexHash[LEXHASHSIZE];
 YY_BUFFER_STATE pCurrentBuffer;

src/asm/main.c

@@ -9,6 +9,7 @@
 
 #include "asm/symbol.h"
 #include "asm/fstack.h"
+#include "asm/lexer.h"
 #include "asm/output.h"
 #include "asm/main.h"
 
@@ -16,8 +17,7 @@
 #include "extern/reallocarray.h"
 #include "extern/version.h"
 
-int yyparse(void);
-void setuplex(void);
+extern int yyparse(void);
 
 int32_t cldefines_index;
 int32_t cldefines_size;
@@ -32,7 +32,6 @@ uint32_t unionStart[128], unionSize[128];
 /* extern int yydebug; */
 
 FILE *dependfile;
-extern char *tzObjectname;
 
 /*
  * Option stack
@@ -384,7 +383,7 @@ int main(int argc, char *argv[])
 
 	tzMainfile = argv[argc - 1];
 
-	setuplex();
+	setup_lexer();
 
 	if (CurrentOptions.verbose)
 		printf("Assembling %s\n", tzMainfile);