Fixes for compiling with -fno-common, default in GCC 10.

Taken from upstream:
https://github.com/qca/open-ath9k-htc-firmware/commit/559e3eba3b4cf103da6b8d022f3e1387278b9db8

diff --git a/target_firmware/magpie_fw_dev/target/init/app_start.c b/target_firmware/magpie_fw_dev/target/init/app_start.c
--- a/target_firmware/magpie_fw_dev/target/init/app_start.c
+++ b/target_firmware/magpie_fw_dev/target/init/app_start.c
@@ -52,6 +52,8 @@
 #define ALLOCRAM_START       ( ((unsigned int)&_fw_image_end) + 4)
 #define ALLOCRAM_SIZE        ( SYS_RAM_SZIE - ( ALLOCRAM_START - SYS_D_RAM_REGION_0_BASE) - SYS_D_RAM_STACK_SIZE)
 
+void (* _assfail_ori)(struct register_dump_s *);
+
 // support for more than 64 bytes on command pipe
 extern void usb_reg_out_patch(void);
 extern int _HIFusb_get_max_msg_len_patch(hif_handle_t handle, int pipe);
diff --git a/target_firmware/magpie_fw_dev/target/init/init.h b/target_firmware/magpie_fw_dev/target/init/init.h
--- a/target_firmware/magpie_fw_dev/target/init/init.h
+++ b/target_firmware/magpie_fw_dev/target/init/init.h
@@ -46,7 +46,7 @@
 void AR6002_fatal_exception_handler_patch(CPU_exception_frame_t *exc_frame);
 void exception_reset(struct register_dump_s *dump);
 
-void (* _assfail_ori)(struct register_dump_s *);
+extern void (* _assfail_ori)(struct register_dump_s *);
 void HTCMsgRecvHandler_patch(adf_nbuf_t hdr_buf, adf_nbuf_t buffer, void *context);
 void HTCControlSvcProcessMsg_patch(HTC_ENDPOINT_ID EndpointID, adf_nbuf_t hdr_buf,
 				   adf_nbuf_t pBuffers, void *arg);
tests/uuid.scm'>
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<div class='path'>path: <a href='/guix/log/?id=2cb81e1ebedc49a5af549d1bcd520add38d9062d'>root</a>/<a href='/guix/log/tests?id=2cb81e1ebedc49a5af549d1bcd520add38d9062d'>tests</a>/<a href='/guix/log/tests/uuid.scm?id=2cb81e1ebedc49a5af549d1bcd520add38d9062d'>uuid.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/uuid.scm?id=2cb81e1ebedc49a5af549d1bcd520add38d9062d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-05-07 12:18:44 +0200'>2019-05-07</span></td><td><a href='/guix/commit/tests/uuid.scm?id=6c5790a2faf8ffc401e43b13425a707394e40874'>uuid: 'fat-uuid-&gt;string' preserves leading zeros.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/35582&gt;.
Reported by sirgazil &lt;sirgazil@zoho.com&gt;.

Previously, leading zeros would be removed, leading to an "invalid"
UUID:

  (uuid-&gt;string (uuid "00CA-050E" 'fat32))
  ⇒ "CA-50E"
  (string-&gt;uuid "CA-50E" 'fat32)
  ⇒ #f

* gnu/system/uuid.scm (fat-uuid-&gt;string): Pad digits with zeros.
* tests/uuid.scm ("uuid, FAT32, leading zeros preserved"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-05-19 00:14:52 +0200'>2018-05-19</span></td><td><a href='/guix/commit/tests/uuid.scm?id=263c9941a1e523b360ca9f42d1ed6b11e6e6e285'>uuid: 'uuid' returns #f when 'string-&gt;uuid' returns #f.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/uuid.scm (uuid): When STR is not a literal, return #f when
'string-&gt;uuid' returns #f.
* tests/uuid.scm ("uuid, dynamic value"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-10-06 14:16:23 +0200'>2017-10-06</span></td><td><a href='/guix/commit/tests/uuid.scm?id=0b12324284f3fbf378d363070f91b794058ae570'>uuid: Fix typo in 'uuid=?' test.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/uuid.scm ("uuid=?"): Change to 'test-assert'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-10-05 12:09:17 +0200'>2017-10-05</span></td><td><a href='/guix/commit/tests/uuid.scm?id=aed1f1b049f6e7ef9f2f2db58bdca6cd3effe94b'>uuid: Add 'uuid=?' and use it.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/uuid.scm (uuid=?): New procedure.
* tests/uuid.scm ("uuid=?"): New test.
* gnu/build/file-systems.scm (partition-uuid-predicate)
(luks-partition-uuid-predicate): Use it instead of 'bytevector=?'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-22 18:40:57 +0200'>2017-09-22</span></td><td><a href='/guix/commit/tests/uuid.scm?id=8a7d81a5e23c4d59fbabf2550db32d4ba5572e4b'>uuid: Add a parser for FAT32 UUIDs.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/uuid.scm (%fat32-uuid-rx): New variable.
(string-&gt;fat32-uuid): New procedure.
(%uuid-parsers): Add it.
* tests/uuid.scm ("uuid, FAT32, format preserved"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-09-14 00:10:13 +0200'>2017-09-14</span></td><td><a href='/guix/commit/tests/uuid.scm?id=8f3b63b5d73c0b49139c8a20b7576732abfdeeb8'>uuid: Move tests to 'tests/uuid.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* tests/file-systems.scm ("uuid-&gt;string", "string-&gt;uuid")
("uuid", "uuid, syntax error"): Move to...
* tests/uuid.scm: ... here.  New file.
("uuid, ISO-9660, format preserved"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>