rebase: Make sure that we execute our dash/bash

The implicit `.` (current working directory) in PATH can cause the script to
call a wrong dash/bash if present alongside the installer.

Fixes https://sourceforge.net/p/msys2/tickets/141/

rebase/PKGBUILD

@@ -2,7 +2,7 @@
 
 pkgname=rebase
 pkgver=4.4.2
-pkgrel=1
+pkgrel=2
 pkgdesc="The Cygwin rebase distribution contains four utilities, rebase, rebaseall, peflags, and peflagsall."
 groups=('base')
 arch=('i686' 'x86_64')
@@ -21,8 +21,8 @@ source=(${pkgname}-${pkgver}::git://sourceware.org/git/cygwin-apps/rebase.git#ta
         'msys2-usr.patch')
 sha256sums=('SKIP'
             '261921df1e581f74751c6dbc5a83c475a57c42bdfef62bdbc9fe8e1f5c648c47'
-            '639db08ad3f8027c50376a2c7aab1d4e1e12e1ff6a893aeb6c07005de426f40b'
-            '207dd9880255ed2fc8864452619f7c1a3ba74c6508dfcfca475af8a6caab412a'
+            '8e4099a29107a1d03031b198c3d142bbc31a40ff19298d6e099d9bcffd31b1b0'
+            '0aed2c3a36e1926af4b0c914d208d4846bb0082d2f4886e6bb17d4b8b7fb42d5'
             'b06d561d82e7c32573082cf0207ca80275bab241c61debf2d3d8cc10cf79e31b'
             '2ca1e58fb1d2625e93224d0d1ca3b86944030ef2572289222b42ccc2387033fd'
             'b4823bfdc169744e05b9c71d513ef570b580ffc9dded4fa482ec644a557de56b'

rebase/autorebase.bat

@@ -1,4 +1,4 @@
 @echo off
 
 set PATH=%~dp0\usr\bin;%PATH%
-dash /usr/bin/rebaseall -p
+%~dp0\usr\bin\dash /usr/bin/rebaseall -p

rebase/autorebasebase1st.bat

@@ -1,14 +1,15 @@
 @echo off
-
 REM Copyright (c) 2014, Ray Donnelly <mingw.android@gmail.com>
 
 set PATH=%~dp0\usr\bin;%PATH%
+
 echo Querying 'base' packages for DLLs ..
-bash /usr/bin/pacman-rec-filename-grep base base-dlls-unix.txt ".*\.(dll|so|oct)$"
-bash /usr/bin/paths-from-unix-to-windows base-dlls-unix.txt base-dlls.txt %CD:\=/%
+%~dp0\usr\bin\bash /usr/bin/pacman-rec-filename-grep base base-dlls-unix.txt ".*\.(dll|so|oct)$"
+%~dp0\usr\bin\bash /usr/bin/paths-from-unix-to-windows base-dlls-unix.txt base-dlls.txt %CD:\=/%
+
 echo Rebasing all DLLs, 'base' ones first ..
 REM   -i is new; it means ignore database and
 REM   rebase from end of {cygwin1,msys-2.0}.dll
 REM   it work by avoiding passing -s to rebase.exe
 REM   which has modifications to support this mode.
-dash /usr/bin/rebaseall -T base-dlls.txt -i -p
+%~dp0\usr\bin\dash /usr/bin/rebaseall -T base-dlls.txt -i -p