Fix a small typo in configure

Signed-off-by: Laslo Hunhold <dev@frign.de>

configure

diff --git a/configure b/configure
index 685b529..379303e 100755
--- a/configure
+++ b/configure
@@ -36,7 +36,7 @@
 		replace_line 'SOSYMLINK' ''     'false'
 		replace_line 'LDCONFIG'  ''     ''
 		;;
-	CYGWIN*|MSYS*|WINGW*)
+	CYGWIN*|MSYS*|MINGW*)
 		replace_line 'ANAME'     '    ' 'libgrapheme.lib'
 		replace_line 'SONAME'    '   '  'libgrapheme.dll'
 		replace_line 'BINSUFFIX' ''     '.exe'