SDL_mixer: Fix detection of dynamic libraries with MinGW (85b75)

From 85b75ee92583fcbd173e32fa58c3d2ac7abd6e0f Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Sat, 7 May 2022 17:50:56 +0300
Subject: [PATCH] Fix detection of dynamic libraries with MinGW

Cherry-picked from SDL_image (https://github.com/libsdl-org/SDL_image/pull/192)
Original patch authored by Cameron Cawley (@ccawley2011)
---
 configure    | 5 ++++-
 configure.ac | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 5309df2b..0da1ac03 100755
--- a/configure
+++ b/configure
@@ -14931,6 +14931,8 @@ case "$host" in
             # Look for the location of the tools and install there
             if test "$BUILD_PREFIX" != ""; then
                 ac_default_prefix=$BUILD_PREFIX
+            elif test "$MINGW_PREFIX" != ""; then
+                ac_default_prefix=$MINGW_PREFIX
             fi
         fi
         ;;
@@ -14950,6 +14952,7 @@ $srcdir/load_voc.c \
 $srcdir/mixer.c \
 $srcdir/music.c"
 
+base_bindir=`echo \${bindir} | sed 's/.*\/\(.*\)/\1/; q'`
 base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`
 
 CheckWarnAll()
@@ -15050,7 +15053,7 @@ find_lib()
     if test "$cross_compiling" = yes; then
         host_lib_path=""
     else
-        host_lib_path="/usr/$base_libdir /usr/local/$base_libdir"
+        host_lib_path="$ac_default_prefix/$base_libdir $ac_default_prefix/$base_bindir /usr/$base_libdir /usr/local/$base_libdir"
     fi
     for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
         lib=`ls -- $path/$1 2>/dev/null | sed -e '/\.so\..*\./d' -e 's,.*/,,' | sort | tail -1`
diff --git a/configure.ac b/configure.ac
index c22f0c6e..191967ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -119,6 +119,8 @@ case "$host" in
             # Look for the location of the tools and install there
             if test "$BUILD_PREFIX" != ""; then
                 ac_default_prefix=$BUILD_PREFIX
+            elif test "$MINGW_PREFIX" != ""; then
+                ac_default_prefix=$MINGW_PREFIX
             fi
         fi
         ;;
@@ -139,6 +141,7 @@ $srcdir/mixer.c \
 $srcdir/music.c"
 
 dnl set this to use on systems that use lib64 instead of lib
+base_bindir=`echo \${bindir} | sed 's/.*\/\(.*\)/\1/; q'`
 base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`
 
 dnl See if GCC's -Wall is supported.
@@ -208,7 +211,7 @@ find_lib()
     if test "$cross_compiling" = yes; then
         host_lib_path=""
     else
-        host_lib_path="/usr/$base_libdir /usr/local/$base_libdir"
+        host_lib_path="$ac_default_prefix/$base_libdir $ac_default_prefix/$base_bindir /usr/$base_libdir /usr/local/$base_libdir"
     fi
     for path in $env_lib_path $gcc_bin_path $gcc_lib_path $host_lib_path; do
         lib=[`ls -- $path/$1 2>/dev/null | sed -e '/\.so\..*\./d' -e 's,.*/,,' | sort | tail -1`]