Bug#802580: arduino-mk: fails to parse certain boards.txt files

[Ssn Kleinmann]

Package: arduino-mk
Version: 1.5-2
Severity: normal
Tags: upstream patch

Dear Maintainer,

I am using some boards from Adafruit, so I downloaded their 
boards.txt file from github
(https://github.com/adafruit/Adafruit_Arduino_Boards).
This file contains some sections for similarly named boards:
e.g., 'trinket3' and 'protrinket3'.

The Arduino.mk file defines a variable, PARSE_BOARD, which parses
the boards.txt file.  However, PARSE_BOARD  does not match the 
board name at the *beginning of the line*.  Consequently, it treats 
all of the lines for 'trinket3' and 'protrinket3' as one large 
stanza, and therefore erroneously gets multiple values for some 
parameters, e.g., mcu or maximum_size.

The attached patch fixes this.

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages arduino-mk depends on:
ii  arduino-core   2:1.0.5+dfsg2-4
ii  make           4.0-8.2
ii  python         2.7.9-1
ii  python-serial  2.7-1

Versions of packages arduino-mk recommends:
ii  screen  4.3.1-2

arduino-mk suggests no packages.

-- no debconf information
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<     PARSE_BOARD = $(shell grep -v '^\#' $(BOARDS_TXT) | grep $(1).$(2)= | cut -d = -f 2 )
---
>     PARSE_BOARD = $(shell grep -v '^\#' $(BOARDS_TXT) | grep -e "^$(1).$(2)=" | cut -d = -f 2 )
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