fix make's impurity on /bin/sh

This is important when using tooling like BEAR to generate compilation database since the used glibc version needs to match for LD_PRELOAD to work. It might be also beneficial when building on systems other than NixOS with nix develop since /bin/sh might be not bash (which is what all nix devs use for testing). This fix is not perfect because Makefile.config.in itself is also build with make but strictly better than the status quo.
NixOS · Jul 18, 2020 · 56b5846 · 56b5846
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commit 56b5846
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diff --git a/Makefile.config.in b/Makefile.config.in
@@ -19,6 +19,7 @@ LIBLZMA_LIBS = @LIBLZMA_LIBS@
 OPENSSL_LIBS = @OPENSSL_LIBS@
 PACKAGE_NAME = @PACKAGE_NAME@
 PACKAGE_VERSION = @PACKAGE_VERSION@
+SHELL = @SHELL@
 SODIUM_LIBS = @SODIUM_LIBS@
 SQLITE3_LIBS = @SQLITE3_LIBS@
 bash = @bash@

diff --git a/configure.ac b/configure.ac
@@ -57,6 +57,7 @@ AC_PROG_CXX
 AC_PROG_CPP
 
 AC_CHECK_TOOL([AR], [ar])
+AC_CHECK_TOOL([SHELL], [sh])
 
 # Use 64-bit file system calls so that we can support files > 2 GiB.
 AC_SYS_LARGEFILE