configure.ac: Don't check LLVM version in gallium_require_llvm

This is actually not needed because the version is checked later.

Line 2609:
if test "x$enable_gallium_llvm" == "xyes"; then
    llvm_require_version $LLVM_REQUIRED_GALLIUM "gallium"
    llvm_add_default_components "gallium"

    HAVE_GALLIUM_LLVM=xyes
    DEFINES="${DEFINES} -DHAVE_GALLIUM_LLVM"
fi

Signed-off-by: Tobias Droste <tdroste@gmx.de>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/configure.ac b/configure.ac
index 5740da6..655b76e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2387,9 +2387,7 @@
 dnl Gallium helper functions
 dnl
 gallium_require_llvm() {
-    if test "x$enable_gallium_llvm" = "xyes"; then
-        llvm_require_version $LLVM_REQUIRED_GALLIUM "gallium"
-    else
+    if test "x$enable_gallium_llvm" != "xyes"; then
         AC_MSG_ERROR([--enable-gallium-llvm is required when building $1])
     fi
 }