Don't forward declare functions with "inline" in headers

Don't mark function definitions in headers with "inline" - it causes
compile warnings on gcc v5.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Acked-by: Paul Menzel <paulepanter@sourceforge.net>
diff --git a/src/hw/usb-hid.h b/src/hw/usb-hid.h
index ef34e79..fd7b8f8 100644
--- a/src/hw/usb-hid.h
+++ b/src/hw/usb-hid.h
@@ -4,10 +4,10 @@
 // usb-hid.c
 struct usbdevice_s;
 int usb_hid_setup(struct usbdevice_s *usbdev);
-inline int usb_kbd_active(void);
-inline int usb_kbd_command(int command, u8 *param);
-inline int usb_mouse_active(void);
-inline int usb_mouse_command(int command, u8 *param);
+int usb_kbd_active(void);
+int usb_kbd_command(int command, u8 *param);
+int usb_mouse_active(void);
+int usb_mouse_command(int command, u8 *param);
 void usb_check_event(void);
 
 
diff --git a/src/string.h b/src/string.h
index a557d6a..d069989 100644
--- a/src/string.h
+++ b/src/string.h
@@ -11,12 +11,12 @@
 int memcmp_far(u16 s1seg, const void *s1, u16 s2seg, const void *s2, size_t n);
 int memcmp(const void *s1, const void *s2, size_t n);
 int strcmp(const char *s1, const char *s2);
-inline void memset_far(u16 d_seg, void *d_far, u8 c, size_t len);
-inline void memset16_far(u16 d_seg, void *d_far, u16 c, size_t len);
+void memset_far(u16 d_seg, void *d_far, u8 c, size_t len);
+void memset16_far(u16 d_seg, void *d_far, u16 c, size_t len);
 void *memset(void *s, int c, size_t n);
 void memset_fl(void *ptr, u8 val, size_t size);
-inline void memcpy_far(u16 d_seg, void *d_far
-                       , u16 s_seg, const void *s_far, size_t len);
+void memcpy_far(u16 d_seg, void *d_far
+                , u16 s_seg, const void *s_far, size_t len);
 void memcpy_fl(void *d_fl, const void *s_fl, size_t len);
 void *memcpy(void *d1, const void *s1, size_t len);
 #if MODESEGMENT == 0