Additional prototypes for C99 compatibility: Declare fopen_datafile

unconditionally because it is used throughout the sources.  Add

a missing prototype for read_test_file_colormap.

Also avoid an implicit int in the definition of aborttech.

Submitted upstream: <https://sourceforge.net/p/slashem/bugs/964/>

diff --git a/include/extern.h b/include/extern.h

index 55a9829cb0f05659..bb5254eeac5fdf08 100644

--- a/include/extern.h

+++ b/include/extern.h

@@ -681,9 +681,7 @@ E void NDECL(makerogueghost);

 E char *FDECL(fname_encode, (const char *, CHAR_P, char *, char *, int));

 E char *FDECL(fname_decode, (CHAR_P, char *, char *, int));

 E const char *FDECL(fqname, (const char *, int, int));

-#ifndef FILE_AREAS

 E FILE *FDECL(fopen_datafile, (const char *,const char *,int));

-#endif

 E boolean FDECL(uptodate, (int,const char *));

 E void FDECL(store_version, (int));

 #ifdef MFLOPPY

diff --git a/src/tech.c b/src/tech.c

index fd6fe46b2478ee40..c25d5808ebcb2280 100644

--- a/src/tech.c

+++ b/src/tech.c

@@ -238,6 +238,7 @@ tech_known(tech)

 /* Called to prematurely stop a technique */

 void

 aborttech(tech)

+int tech;

 {

 	int i;

diff --git a/win/share/tile_t.h b/win/share/tile_t.h

index c28f8dd37624a91d..01bdfe71ae7e97ed 100644

--- a/win/share/tile_t.h

+++ b/win/share/tile_t.h

@@ -39,6 +39,7 @@ extern int tile_x, tile_y;

 #define pixel_equal(x,y) ((x.r == y.r) && (x.g == y.g) && (x.b == y.b))

+extern boolean FDECL(read_text_file_colormap, (const char *filename));

 extern boolean FDECL(fopen_text_file, (const char *, const char *));

 extern boolean FDECL(fopen_virtual_text_file, (const char *base_name,

 		const char *overlay_name, const char *type));