Add missing config.h on .c files

[dgarske]

Description

• Add missing config.h on some .c files.
• Fix to remove NO_BIG_INT from MICROCHIP_PIC32 in settings.h.

Testing

Microchip MPLABX

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[dgarske]

Retest this please. 'PRB-single-flag.txt_125' -> FAIL: scripts/openssl.test

Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : DHE-RSA-AES128-SHA256
    Session-ID: F5419BEB6A9A12928B17694A07B815259CDF1B1FCB75088BE5C82E1397BBC61C
    Session-ID-ctx: 
    Master-Key: 5A29B4087C7122B600E004143AC77FEF79BDC19C38B4DB4FBC175A63B4387A945F78BFF20642A9B876C24A01716FC2B8
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    TLS session ticket lifetime hint: 300 (seconds)
    TLS session ticket:
    0000 - 44 b9 f1 82 8c 8e f4 e3-09 5b 95 77 50 f0 bd 40   D........[.wP..@
    0010 - d8 29 fb 11 5f 4c f0 3d-90 34 e2 f0 7c d9 0c 05   .).._L.=.4..|...
    0020 - 00 8d e9 16 d7 44 b6 b6-29 c7 46 bb 46 79 17 0e   .....D..).F.Fy..
    0030 - 87 3e 11 c1 60 c0 4c 76-c0 19 07 42 5a 45 41 35   .>..`.Lv...BZEA5
    0040 - 7d 27 38 48 cf 57 34 c5-85 ff a0 61 e0 9d 04 26   }'8H.W4....a...&
    0050 - 18 ba 97 6f cc 92 a0 2b-cd f7 4b 10 8d d3 59 07   ...o...+..K...Y.
    0060 - 03 d5 c1 6c 51 67 5b 36-ed 3b 00 39 d5 1c e2 22   ...lQg[6.;.9..."
    0070 - 0f 73 9e 87 58 24 ad 65-70 c4 e7 00 49 48 42 fe   .s..X$.ep...IHB.
    0080 - 42 c4 c7 dd 68 fc bb 01-dd 87 5e 5d 37 7e ce 8a   B...h.....^]7~..
    0090 - a6 f7 b8 5b 8a d2 77 34-89 73 43 de 43 cb 2b b0   ...[..w4.sC.C.+.
    00a0 - 46 73 f5 47 3c 4b 5d e9-3f d7 f0 08 45 9a 01 97   Fs.G<K].?...E...
    00b0 - bf 94 f6 b6 3d 47 55 49-6a f8 6e e7 05 64 8f 00   ....=GUIj.n..d..
    00c0 - 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00      ...............
    Start Time: 1723481609
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: yes
---
client failed! Suite = DHE-RSA-AES128-SHA256 version = 3
in cleanup