Description:
------------
pecl_http doesn't compile with libevent2; looks like a syntax error in a header:

#define PHP_HTTP_EVENT_VERSION ""2.0.21-stable""

As you can see, the quotes are doubled.

Test script:
---------------
sudo pecl install pecl_http

Actual result:
--------------
In file included from /tmp/pear/temp/pecl_http/php_http_api.h:17:0,
                 from /tmp/pear/temp/pecl_http/php_http.c:13:
/tmp/pear/temp/pecl_http/php_http.c: In function 'zm_info_http':
./config.h:93:34: error: too many decimal points in number
 #define PHP_HTTP_EVENT_VERSION ""2.0.21-stable""
                                  ^
/tmp/pear/temp/pecl_http/php_http.c:242:4: note: in expansion of macro 'PHP_HTTP_EVENT_VERSION'
    PHP_HTTP_EVENT_VERSION,
    ^
./config.h:93:34: error: expected ')' before numeric constant
 #define PHP_HTTP_EVENT_VERSION ""2.0.21-stable""
                                  ^
/tmp/pear/temp/pecl_http/php_http.c:242:4: note: in expansion of macro 'PHP_HTTP_EVENT_VERSION'
    PHP_HTTP_EVENT_VERSION,
    ^
make: *** [php_http.lo] Error 1
ERROR: `make' failed